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Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Investment fair value changes, net $ (1,609,000) $ (1,551,000)
Realized gains, net (9,363,000) (5,703,000)
Interest expense 41,514,000 21,031,000
Net Income before Provision for Income Taxes (51,741,000) (43,126,000)
Impairment losses, investments 0  
Other than temporary impairment recognized in AOCI   100,000
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 0 117,000
Realized gains, net (9,387,000) (4,045,000)
Net Income before Provision for Income Taxes (9,387,000) (3,928,000)
Impairment losses, investments   200,000
Impairment losses recognized in earnings   100,000
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 0 14,000
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 $ 0 $ 14,000