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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
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period $ 2,776 $ 88,443 $ 1,719 $ 6,726
Total unrealized gains (losses)        
Included in net investment income   (298) (118) (324)
Included in other income   (348)   (348)
Total realized gains (losses)        
Included in other income 2,092 1,512 3,792 2,828
Total foreign exchange gains (losses)   (6)    
Purchases (48) 1,544 (573) 81,965
Settlements (7,500) (7,500) (7,500) (7,500)
Balance at end of the period (2,680) 83,347 (2,680) 83,347
Net investment income        
Total realized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period   (116) 0 (142)
Other income (loss)        
Total realized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period   (348)   (348)
Fixed maturity investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period 7,500 15,474 7,618 15,660
Total unrealized gains (losses)        
Included in net investment income   (314) (118) (500)
Included in other income   0   0
Total realized gains (losses)        
Included in other income 0 0 0 0
Total foreign exchange gains (losses)   0    
Purchases 0 0 0 0
Settlements (7,500) (7,500) (7,500) (7,500)
Balance at end of the period 0 7,660 0 7,660
Fixed maturity investments | Net investment income        
Total realized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period   (132) 0 (318)
Fixed maturity investments | Other income (loss)        
Total realized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period   0   0
Other assets and (liabilities)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of the period (4,724) 72,969 (5,899) (8,934)
Total unrealized gains (losses)        
Included in net investment income   16 0 176
Included in other income   (348)   (348)
Total realized gains (losses)        
Included in other income 2,092 1,512 3,792 2,828
Total foreign exchange gains (losses)   (6)    
Purchases (48) 1,544 (573) 81,965
Settlements 0 0 0 0
Balance at end of the period $ (2,680) 75,687 (2,680) 75,687
Other assets and (liabilities) | Net investment income        
Total realized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period   16 $ 0 176
Other assets and (liabilities) | Other income (loss)        
Total realized gains (losses)        
Change in unrealized gains for the period included in earnings for assets held at the end of the period   $ (348)   $ (348)