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Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   $ 165,346  
Ending Balance $ 9,675 9,675  
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   (234) $ (402)
Change in OCI before reclassifications   (6,590) 149
Amounts reclassified from AOCI   0 0
Income tax benefit (expense)   1,384 (52)
Ending Balance (5,490) (5,490) (305)
Net unrealized investment gains (losses)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   165,580 71,377
Change in OCI before reclassifications   (223,420) 129,391
Amounts reclassified from AOCI   (3,634) (75)
Income tax benefit (expense)   47,679 (45,260)
Ending Balance 15,165 15,165 155,433
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   165,346 70,975
Change in OCI before reclassifications   (230,010) 129,540
Amounts reclassified from AOCI   (3,634) (75)
Income tax benefit (expense)   49,063 (45,312)
Ending Balance 9,675 9,675 155,128
ASU 2016-01 | Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cumulative effect of adoption 0 0  
ASU 2016-01 | Net unrealized investment gains (losses)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cumulative effect of adoption (1,539) (1,539)  
ASU 2016-01 | Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cumulative effect of adoption (1,539) (1,539)  
ASU 2018-02      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 30,400    
ASU 2018-02 | Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cumulative effect of adoption (50) (50)  
ASU 2018-02 | Net unrealized investment gains (losses)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cumulative effect of adoption 30,499 30,499  
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Cumulative effect of adoption 30,449 30,449  
Cash flow hedges | Net unrealized investment gains (losses)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   (18,000) 41,000
Ending Balance $ (9,000) $ (9,000) $ 18,000