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Stockholders' Equity (Amounts Reclassified out of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Amounts Reclassified from AOCI          
Realized gain on sale of securities $ 17,708 $ 16,415 $ 50,027 $ 32,661  
Net Income Available to Common Stock and Participating Securities 91,569 83,141 265,438 228,970  
Total reclassifications for period (15,184) (9,455) (38,139) (25,580)  
Accumulated Other Comprehensive Income/(Loss)          
Unrealized losses recorded in AOCI on securities for which Other-than-temporary impairments had been recognized in earnings in prior periods 0   0   $ 224
Amounts Reclassified from AOCI | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest          
Amounts Reclassified from AOCI          
Realized gain on sale of securities (14,499) (9,455) (36,370) (25,580)  
Net Income Available to Common Stock and Participating Securities (14,499) $ (9,455) (36,370) $ (25,580)  
Total Swaps designated as cash flow hedges $ (685)   $ (1,769)