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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ 1,827,231 $ 1,348,794
Total other comprehensive loss (127,044) (8,613)
Balance at End of Period 725,202 1,549,927
Net Unrealized Gains on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period 92,452 95,342
Other comprehensive income (loss) before reclassifications (80,519) 6,718
Amounts reclassified from other accumulated comprehensive income (13,798) (9,493)
Total other comprehensive loss (94,317) (2,775)
Balance at End of Period (1,865) 92,567
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (50,939) (34,045)
Other comprehensive income (loss) before reclassifications (32,806) (5,838)
Amounts reclassified from other accumulated comprehensive income 79 0
Total other comprehensive loss (32,727) (5,838)
Balance at End of Period $ (83,666) $ (39,883)