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Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Apr. 01, 2018
Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning Balance     $ (28,296)          
Income tax benefit (expense) $ (38,512) $ 18,363 (72,145) $ 49,063        
Cumulative effect of adoption           $ (27)    
Ending Balance 250,165   250,165          
Foreign Currency Translation Adjustments                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning Balance     (17,448) (234)        
Change in OCI before reclassifications     7,007 (6,590)        
Amounts reclassified from AOCI     0 0        
Income tax benefit (expense)     2 1,384        
Ending Balance (10,439) (5,490) (10,439) (5,490)        
Net unrealized investment gains (losses)                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning Balance     (10,848) 165,580        
Change in OCI before reclassifications     332,927 (223,420)        
Amounts reclassified from AOCI     10,672 (3,634)        
Income tax benefit (expense)     (72,147) 47,679        
Ending Balance 260,604 15,165 260,604 15,165        
Accumulated Other Comprehensive Income (Loss)                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning Balance     (28,296) 165,346        
Change in OCI before reclassifications     339,934 (230,010)        
Amounts reclassified from AOCI     10,672 (3,634)        
Income tax benefit (expense)     (72,145) 49,063        
Cumulative effect of adoption [1]         $ 0      
Ending Balance 250,165 9,675 250,165 9,675        
ASU 2016-01 | Foreign Currency Translation Adjustments                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Cumulative effect of adoption   0   0        
ASU 2016-01 | Net unrealized investment gains (losses)                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Cumulative effect of adoption   (1,539)   (1,539)        
ASU 2016-01 | Accumulated Other Comprehensive Income (Loss)                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Cumulative effect of adoption   (1,539)   (1,539)     $ 0 $ (1,539)
ASU 2018-02 | Foreign Currency Translation Adjustments                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Cumulative effect of adoption   (50)   (50)        
ASU 2018-02 | Net unrealized investment gains (losses)                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Cumulative effect of adoption   30,499   30,499        
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss)                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Cumulative effect of adoption   30,449   30,449     $ 50 $ 30,399
Cash flow hedges | Net unrealized investment gains (losses)                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning Balance     (18,000) 41,000        
Ending Balance $ 29,000 $ (9,000) $ 29,000 $ (9,000)        
[1]
Includes the impact from the adoption of ASUs 2017-08 and 2017-12. See Note 2.