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Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 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) $ (21,147) $ 8,093 (93,292) $ 57,156        
Cumulative effect of adoption           $ (27)    
Ending Balance 329,094   329,094          
Foreign Currency Translation Adjustments                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Beginning Balance     (17,448) (234)        
Change in OCI before reclassifications     5,980 (12,379)        
Amounts reclassified from AOCI     0 0        
Income tax benefit (expense)     87 2,599        
Ending Balance (11,381) (10,064) (11,381) (10,064)        
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     453,784 (254,515)        
Amounts reclassified from AOCI     (9,082) (5,268)        
Income tax benefit (expense)     (93,379) 54,557        
Ending Balance 340,475 (10,686) 340,475 (10,686)        
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     459,764 (266,894)        
Amounts reclassified from AOCI     (9,082) (5,268)        
Income tax benefit (expense)     (93,292) 57,156        
Cumulative effect of adoption [1]         $ 0      
Ending Balance 329,094 (20,750) 329,094 (20,750)        
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)       $ (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 $ 54,000 $ (8,000) $ 54,000 $ (8,000)        
[1]
Includes the impact from the adoption of ASUs 2017-08 and 2017-12. See Note 2.