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Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Changes in assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)    
Balance at beginning of period $ 21,293 $ 58,003
Total net realized loss included in investment income and other (162) (290)
Total net unrealized gain included in other comprehensive income 358 2,790
Sales 0 (12,000)
Calls by issuers (9,938) (27,210)
Balance at end of period $ 11,551 $ 21,293