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Fair Value (Details 2) (Asset-backed securities, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Asset-backed securities
       
Changes to Level 3 assets        
Balance, beginning of period $ 2,083 $ 5,858 $ 2,798 $ 2,605
Total realized and unrealized gains for the period included in net income (loss) (93) (63) (2) 301
Total realized and unrealized gains for the period included in other comprehensive income (43) 86 (53) 378
Purchases   358   3,843
Settlements (192) (307) (988) (1,400)
Foreign currency translation adjustments   36   241
Balance, end of period $ 1,755 $ 5,968 $ 1,755 $ 5,968