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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period $ 1,549,927 $ 1,219,983 $ 1,348,794 $ 1,212,287
Total other comprehensive loss (3,761) (4,435) (12,374) (9,628)
Balance at End of Period 1,564,032 1,228,955 1,564,032 1,228,955
Net Unrealized Gains on Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period 92,567 114,577 95,342 128,201
Other comprehensive income (loss) before reclassifications 8,562 (3,104) 15,280 (7,341)
Amounts reclassified from other accumulated comprehensive income (2,822) (4,748) (12,315) (14,135)
Total other comprehensive loss 5,740 (7,852) 2,965 (21,476)
Balance at End of Period 98,307 106,725 98,307 106,725
Other comprehensive income (loss) before reclassifications, tax   200   100
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 (39,883)   (34,045)  
Other comprehensive income (loss) before reclassifications (9,501)   (15,339)  
Amounts reclassified from other accumulated comprehensive income 0   0  
Total other comprehensive loss (9,501)   (15,339)  
Balance at End of Period $ (49,384)   (49,384)  
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   (34,522) $ (34,000) (42,953)
Other comprehensive income (loss) before reclassifications   3,417   11,848
Amounts reclassified from other accumulated comprehensive income   0   0
Total other comprehensive loss   3,417   11,848
Balance at End of Period   $ (31,105)   $ (31,105)