|
Fair Value Measurements (Summary Of Assets and Liabilities Recorded At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified
|
Mar. 31, 2012
|
Dec. 31, 2011
|
Mar. 31, 2011
|
Dec. 31, 2010
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
$ 566,416 |
$ 9,072,646 |
|
|
| Equity securities |
0 |
8,503 |
|
|
| Derivatives, assets |
51,958 |
100,475 |
|
|
| Fair value, total |
618,374 |
9,181,624 |
|
|
| Contingent Consideration |
138,328 |
135,591 |
11,100 |
11,100 |
| Derivatives, liabilities |
18,404 |
5,710 |
|
|
| Fair value, total |
156,732 |
141,301 |
|
|
|
Money Market Funds [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
518,248 |
7,455,982 |
|
|
|
Certificates of Deposit [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
1,139,982 |
|
|
|
Non-U.S. Government Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
24,741 |
|
|
|
Corporate Debt Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
404,989 |
|
|
|
Student Loan-Backed Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
48,168 |
46,952 |
|
|
|
Level 1 [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
518,248 |
7,455,982 |
|
|
| Equity securities |
0 |
8,503 |
|
|
| Derivatives, assets |
0 |
0 |
|
|
| Fair value, total |
518,248 |
7,464,485 |
|
|
| Contingent Consideration |
0 |
0 |
|
|
| Derivatives, liabilities |
0 |
0 |
|
|
| Fair value, total |
0 |
0 |
|
|
|
Level 1 [Member] | Money Market Funds [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
518,248 |
7,455,982 |
|
|
|
Level 1 [Member] | Certificates of Deposit [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
0 |
|
|
|
Level 1 [Member] | Non-U.S. Government Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
0 |
|
|
|
Level 1 [Member] | Corporate Debt Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
0 |
|
|
|
Level 1 [Member] | Student Loan-Backed Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
0 |
|
|
|
Level 2 [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
1,544,971 |
|
|
| Equity securities |
0 |
0 |
|
|
| Derivatives, assets |
51,958 |
100,475 |
|
|
| Fair value, total |
51,958 |
1,645,446 |
|
|
| Contingent Consideration |
0 |
0 |
|
|
| Derivatives, liabilities |
18,404 |
5,710 |
|
|
| Fair value, total |
18,404 |
5,710 |
|
|
|
Level 2 [Member] | Money Market Funds [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
0 |
|
|
|
Level 2 [Member] | Certificates of Deposit [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
1,139,982 |
|
|
|
Level 2 [Member] | Non-U.S. Government Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
0 |
|
|
|
Level 2 [Member] | Corporate Debt Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
404,989 |
|
|
|
Level 2 [Member] | Student Loan-Backed Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
0 |
|
|
|
Level 3 [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
48,168 |
71,693 |
|
|
| Equity securities |
0 |
0 |
|
|
| Derivatives, assets |
0 |
0 |
|
|
| Fair value, total |
48,168 |
71,693 |
|
|
| Contingent Consideration |
138,328 |
135,591 |
|
|
| Derivatives, liabilities |
0 |
0 |
|
|
| Fair value, total |
138,328 |
135,591 |
|
|
|
Level 3 [Member] | Money Market Funds [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
0 |
|
|
|
Level 3 [Member] | Certificates of Deposit [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
0 |
|
|
|
Level 3 [Member] | Non-U.S. Government Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
24,741 |
|
|
|
Level 3 [Member] | Corporate Debt Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
0 |
0 |
|
|
|
Level 3 [Member] | Student Loan-Backed Securities [Member]
|
|
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
|
|
| Estimated Fair Value, Debt securities |
$ 48,168 |
$ 46,952 |
|
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