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Fair Value (Details 2) (Asset-backed securities, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Asset-backed securities
       
Changes to Level 3 assets        
Balance, beginning of period $ 2,494 $ 5,646 $ 2,798 $ 2,605
Total realized and unrealized gains for the period included in net income (loss) (68) 197 91 364
Total realized and unrealized gains for the period included in other comprehensive income 41 244 (10) 292
Purchases   224   3,485
Settlements (384) (551) (796) (1,093)
Foreign currency translation adjustments   98   205
Balance, end of period $ 2,083 $ 5,858 $ 2,083 $ 5,858