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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ 1,348,794 $ 1,212,287
Total other comprehensive loss (8,613) (5,193)
Balance at End of Period 1,549,927 1,219,983
Net Unrealized Gains on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period 95,342 128,201
Other comprehensive (loss) income before reclassifications 6,718 (4,237)
Amounts reclassified from other accumulated comprehensive income (9,493) (9,387)
Total other comprehensive loss (2,775) (13,624)
Balance at End of Period 92,567 114,577
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 (34,045)  
Other comprehensive (loss) income before reclassifications (5,838)  
Amounts reclassified from other accumulated comprehensive income 0  
Total other comprehensive loss (5,838)  
Balance at End of Period (39,883)  
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 (34,000) (42,953)
Other comprehensive (loss) income before reclassifications   8,431
Amounts reclassified from other accumulated comprehensive income   0
Total other comprehensive loss   8,431
Balance at End of Period $ (40,000) $ (34,522)