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Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Investment fair value changes, net                 $ (10,374) $ 28,574 $ 21,357
Realized gains, net                 (13,355) (28,009) (36,369)
Interest expense $ 36,108 $ 27,443 $ 24,234 $ 21,031 $ 20,537 $ 21,597 $ 22,444 $ 23,950 108,816 88,528 95,883
Net income before provision for income taxes                 (152,158) (134,960) $ (91,742)
Other than temporary impairments                 1,000 3,000  
Other than temporary impairment losses, income statement                 1,000 400  
Accumulated other comprehensive income, other-than-temporary impairments                 400 3,000  
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gains on Available-for-Sale Securities                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Investment fair value changes, net                 1,012 368  
Realized gains, net                 (11,548) (21,535)  
Net income before provision for income taxes                 (10,536) (21,167)  
Other than temporary impairment losses, income statement                 1,000    
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net income before provision for income taxes                 45 72  
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges | Interest Rate Contract                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Interest expense                 $ 45 $ 72