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Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Realized gains, net $ (10,686) $ (9,363)
Net Income before Provision for Income Taxes (55,347) (51,741)
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]    
Realized gains, net (9,493) (9,387)
Net Income before Provision for Income Taxes $ (9,493) $ (9,387)