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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, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ (90,124)  
Income tax benefit (expense) $ 12,265 $ (63,372) 49,445 $ (82,398)
Ending balance (312,842)   (312,842)  
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (7) (78)
Change in OCI before reclassifications     (1,128) 64
Amounts reclassified from AOCI     0 0
Income tax benefit (expense)     237 (22)
Ending balance (900) (36) (900) (36)
Net Unrealized Investment Gains (Losses)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (90,117) (314,870)
Change in OCI before reclassifications     (282,772) 233,617
Amounts reclassified from AOCI     48,454 1,743
Income tax benefit (expense)     49,208 (82,376)
Ending balance (311,942) (161,886) (311,942) (161,886)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (90,124) (314,948)
Change in OCI before reclassifications     (283,900) 233,681
Amounts reclassified from AOCI     48,454 1,743
Income tax benefit (expense)     49,445 (82,398)
Ending balance (312,842) (161,922) (312,842) (161,922)
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 (3)   (3)  
ASU 2016-01 | Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative effect of adoption (3)   (3)  
ASU 2018-02        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (36,700)      
ASU 2018-02 | Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative effect of adoption (2)   (2)  
ASU 2018-02 | Net Unrealized Investment Gains (Losses)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative effect of adoption (36,712)   (36,712)  
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative effect of adoption (36,714)   (36,714)  
Cash flow hedges | Net Unrealized Investment Gains (Losses)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (26,000) 12,000
Ending balance $ (24,000) $ (3,000) $ (24,000) $ (3,000)