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Fair Value (Details 2) (Asset-backed securities, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Asset-backed securities
   
Changes to Level 3 assets    
Balance, beginning of period $ 2,798 $ 2,605
Total realized and unrealized gains for the period included in net income (loss) 100 354
Total realized and unrealized gains for the period included in other comprehensive income (58) (396)
Purchases   3,843
Sales   (1,980)
Settlements (1,170) (1,789)
Foreign currency translation adjustments   161
Balance, end of period $ 1,670 $ 2,798