|
Fair Value Measurements - Rollforward of significant unobservable inputs (Details) (USD $)
In Thousands, unless otherwise specified |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||
| Balance, at beginning of period | $ 0 | $ 81,995 |
| Total gains or losses | ||
| Realized gain included in earnings | 0 | 15,587 |
| Reclassification of previous unrealized gain out of other comprehensive income | 0 | (14,654) |
| Unrealized loss included in other comprehensive income, net | 0 | (1,713) |
| Purchases, issuances, settlements, sales and accretion | ||
| Purchases | 0 | 0 |
| Issuances | 0 | 0 |
| Settlements | 0 | (82,061) |
| Accretion of discount included in earnings | 0 | 846 |
| Balance, at end of period | $ 0 | $ 0 |