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Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Investment fair value changes, net $ 1,551,000 $ (19,538,000)
Realized gains, net 5,703,000 9,538,000
Interest expense 21,031,000 23,950,000
Net Income before Provision for Income Taxes 43,126,000 12,091,000
Other than temporary impairment recognized in AOCI 100,000 0
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 117,000 0
Realized gains, net (4,045,000) (10,953,000)
Net Income before Provision for Income Taxes (3,928,000) (10,953,000)
Other than temporary impairment 200,000  
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 14,000 18,000
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 $ 14,000 $ 18,000