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Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Investment fair value changes, net $ (8,115) $ 11,066 $ (9,666) $ 30,604
Realized gains, net (1,372) (9,884) (7,075) (19,422)
Interest expense 24,234 22,444 45,265 46,394
Net Income before Provision for Income Taxes (41,646) (41,608) (84,772) (53,699)
Other than temporary impairment recognized in AOCI 300 2,000 400 2,000
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 128 305 245 305
Realized gains, net (2,450) (8,016) (6,495) (18,969)
Net Income before Provision for Income Taxes (2,322) (7,711) (6,250) (18,664)
Other than temporary impairment 500 3,000   3,000
Other-than-temporary impairments related to AFS securities     600  
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 14 19 28 37
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 $ 14 $ 19 $ 28 $ 37