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Equity (Accumulated Other Comprehensive Income (Loss)) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 165,346  
Ending Balance (20,750)  
Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (234) $ (402)
Change in OCI before reclassifications (12,379) 224
Amounts reclassified from AOCI 0 0
Income tax benefit (expense) 2,599 (78)
Ending Balance (10,064) (256)
Net unrealized investment gains (losses)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 165,580 71,377
Change in OCI before reclassifications (254,515) 147,980
Amounts reclassified from AOCI (5,268) (28,669)
Income tax benefit (expense) 54,557 (41,759)
Ending Balance (10,686) 148,929
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 165,346 70,975
Change in OCI before reclassifications (266,894) 148,204
Amounts reclassified from AOCI (5,268) (28,669)
Income tax benefit (expense) 57,156 (41,837)
Ending Balance (20,750) 148,673
ASU 2016-01 | Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cumulative effect of adoption 0  
ASU 2016-01 | Net unrealized investment gains (losses)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cumulative effect of adoption (1,539)  
ASU 2016-01 | Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cumulative effect of adoption (1,539)  
ASU 2018-02    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Ending Balance 30,400  
ASU 2018-02 | Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cumulative effect of adoption (50)  
ASU 2018-02 | Net unrealized investment gains (losses)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cumulative effect of adoption 30,499  
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cumulative effect of adoption 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 $ (8,000) $ 1,000