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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ 1,348,794 $ 1,212,287 $ 1,149,428
Total other comprehensive (loss) income (19,784) (23,951) 13,395
Balance at End of Period 1,827,231 1,348,794 1,212,287
Net Unrealized Gains on Available-for-Sale Securities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period 95,342 128,201  
Other comprehensive income (loss) before reclassifications 17,077 (7,298)  
Amounts reclassified from other accumulated comprehensive income (19,967) (25,561)  
Total other comprehensive (loss) income (2,890) (32,859)  
Balance at End of Period 92,452 95,342 128,201
Other comprehensive income (loss). before reclassification adjustments, tax benefit (provision)   2,000  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (34,045)    
Other comprehensive income (loss) before reclassifications (16,894)    
Amounts reclassified from other accumulated comprehensive income 0    
Total other comprehensive (loss) income (16,894)    
Balance at End of Period (50,939) (34,045)  
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ (34,045) (42,953)  
Other comprehensive income (loss) before reclassifications   8,908  
Amounts reclassified from other accumulated comprehensive income   0  
Total other comprehensive (loss) income   8,908  
Balance at End of Period   $ (34,045) $ (42,953)