|
Fair Value Measurements (Rollforward Of Assets Measured Using Level 3 Inputs) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
| Fair Value Measurements [Abstract] | ||
| Balance, beginning of period | $ 80,365 | $ 105,662 |
| Total realized and unrealized gains (losses) included in Interest and other income, net | 6,251 | 115 |
| Total realized and unrealized gains (losses) included in Other comprehensive income (loss), net | (30,376) | 5,026 |
| Sales of marketable securities | (38,430) | (40,032) |
| Transfers into Level 3 | 53,883 | 9,594 |
| Balance, end of period | $ 71,693 | $ 80,365 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|