|
Fair Value Measurements (Summary Of Assets And Liabilities Recorded At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified
|
Dec. 31, 2011
|
Dec. 31, 2010
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
$ 9,072,646 |
$ 4,944,507 |
| Equity securities |
8,503 |
4,631 |
| Derivatives, assets |
100,475 |
64,461 |
| Fair value assets, total |
9,181,624 |
5,013,599 |
|
U.S. Treasury Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
1,355,437 |
|
Money Market Funds [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
7,455,982 |
520,063 |
|
Certificates Of Deposit [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
1,139,982 |
127,619 |
|
U.S. Government Agencies And FDIC Guaranteed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
1,296,110 |
|
Municipal Debt Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
17,625 |
|
Non-U.S. Government Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
24,741 |
288,204 |
|
Corporate Debt Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
404,989 |
991,635 |
|
Residential Mortgage And Asset-Backed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
277,043 |
|
Student Loan-Backed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
46,952 |
70,771 |
|
Level 1 [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
7,455,982 |
1,875,500 |
| Equity securities |
8,503 |
4,631 |
| Derivatives, assets |
0 |
0 |
| Fair value assets, total |
7,464,485 |
1,880,131 |
|
Level 1 [Member] | U.S. Treasury Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
1,355,437 |
|
Level 1 [Member] | Money Market Funds [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
7,455,982 |
520,063 |
|
Level 1 [Member] | Certificates Of Deposit [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 1 [Member] | U.S. Government Agencies And FDIC Guaranteed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 1 [Member] | Municipal Debt Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 1 [Member] | Non-U.S. Government Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 1 [Member] | Corporate Debt Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 1 [Member] | Residential Mortgage And Asset-Backed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 1 [Member] | Student Loan-Backed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 2 [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
1,544,971 |
2,988,642 |
| Equity securities |
0 |
0 |
| Derivatives, assets |
100,475 |
64,461 |
| Fair value assets, total |
1,645,446 |
3,053,103 |
|
Level 2 [Member] | U.S. Treasury Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 2 [Member] | Money Market Funds [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 2 [Member] | Certificates Of Deposit [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
1,139,982 |
127,619 |
|
Level 2 [Member] | U.S. Government Agencies And FDIC Guaranteed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
1,296,110 |
|
Level 2 [Member] | Municipal Debt Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
17,625 |
|
Level 2 [Member] | Non-U.S. Government Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
278,610 |
|
Level 2 [Member] | Corporate Debt Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
404,989 |
991,635 |
|
Level 2 [Member] | Residential Mortgage And Asset-Backed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
277,043 |
|
Level 2 [Member] | Student Loan-Backed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 3 [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
71,693 |
80,365 |
| Equity securities |
0 |
0 |
| Derivatives, assets |
0 |
0 |
| Fair value assets, total |
71,693 |
80,365 |
|
Level 3 [Member] | U.S. Treasury Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 3 [Member] | Money Market Funds [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 3 [Member] | Certificates Of Deposit [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 3 [Member] | U.S. Government Agencies And FDIC Guaranteed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 3 [Member] | Municipal Debt Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 3 [Member] | Non-U.S. Government Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
24,741 |
9,594 |
|
Level 3 [Member] | Corporate Debt Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 3 [Member] | Residential Mortgage And Asset-Backed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
0 |
0 |
|
Level 3 [Member] | Student Loan-Backed Securities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
46,952 |
70,771 |
|
Liabilities [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Contingent consideration |
135,591 |
11,100 |
| Derivatives, liabilities |
5,710 |
38,553 |
| Fair value liabilities, total |
141,301 |
49,653 |
|
Liabilities [Member] | Level 1 [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Contingent consideration |
0 |
0 |
| Derivatives, liabilities |
0 |
0 |
| Fair value liabilities, total |
0 |
0 |
|
Liabilities [Member] | Level 2 [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Contingent consideration |
0 |
0 |
| Derivatives, liabilities |
5,710 |
38,553 |
| Fair value liabilities, total |
5,710 |
38,553 |
|
Liabilities [Member] | Level 3 [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Contingent consideration |
135,591 |
11,100 |
| Derivatives, liabilities |
0 |
0 |
| Fair value liabilities, total |
$ 135,591 |
$ 11,100 |