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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period $ 452,813 $ 400,386
Total unrealized gains (losses)    
Included in net investment income 24,978 29,449
Included in other income (loss) 330 (4,528)
Total realized gains (losses)    
Included in net investment income 0 (223)
Included in other income (loss) (28,308) 38,318
Total foreign exchange gains (losses) 741 (1,730)
Purchases 117,812 130,836
Sales (118,901) (44,562)
Settlements (14,666) (101,695)
Net transfers into Level 3 0 6,562
Balance at end of the period 434,799 452,813
Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income (loss) 24,978 29,449
Change in unrealized losses for the period included in earnings for assets held at the end of the period included in other (loss) income 10,892 4,932
Fixed maturity investments [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period 27,761 21,785
Total unrealized gains (losses)    
Included in net investment income 31 5,976
Included in other income (loss) 0 0
Total realized gains (losses)    
Included in net investment income 0 0
Included in other income (loss) 0 0
Total foreign exchange gains (losses) 0 0
Purchases 0 0
Sales 0 0
Settlements 0 0
Net transfers into Level 3 0 0
Balance at end of the period 27,792 27,761
Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income (loss) 31 5,976
Change in unrealized losses for the period included in earnings for assets held at the end of the period included in other (loss) income 0 0
Other Investments [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period 396,526 362,102
Total unrealized gains (losses)    
Included in net investment income 24,947 23,473
Included in other income (loss) 0 0
Total realized gains (losses)    
Included in net investment income 0 (223)
Included in other income (loss) 0 0
Total foreign exchange gains (losses) 699 (1,635)
Purchases 48,631 74,293
Sales (2,842) 0
Settlements (86,894) (68,046)
Net transfers into Level 3 0 6,562
Balance at end of the period 381,067 396,526
Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income (loss) 24,947 23,473
Change in unrealized losses for the period included in earnings for assets held at the end of the period included in other (loss) income 0 0
Other Assets and (Liabilities) [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of the period 28,526 16,499
Total unrealized gains (losses)    
Included in net investment income 0 0
Included in other income (loss) 330 (4,528)
Total realized gains (losses)    
Included in net investment income 0 0
Included in other income (loss) (28,308) 38,318
Total foreign exchange gains (losses) 42 (95)
Purchases 69,181 56,543
Sales (116,059) (44,562)
Settlements 72,228 (33,649)
Net transfers into Level 3 0 0
Balance at end of the period 25,940 28,526
Change in unrealized gains for the period included in earnings for assets held at the end of the period included in net investment income (loss) 0 0
Change in unrealized losses for the period included in earnings for assets held at the end of the period included in other (loss) income $ 10,892 $ 4,932