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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period $ 1,212,287 $ 1,149,428
Balance at End of Period 1,348,794 1,212,287
Other comprehensive income (loss). before reclassification adjustments, tax benefit (provision) 2,000  
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 128,201 115,873
Other comprehensive income (loss) before reclassifications (7,298) 22,864
Amounts reclassified from other accumulated comprehensive income (25,561) (10,536)
Net current-period other comprehensive income (loss) (32,859) 12,328
Balance at End of Period 95,342 128,201
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 (42,953) (44,020)
Other comprehensive income (loss) before reclassifications 8,908 1,022
Amounts reclassified from other accumulated comprehensive income 0 45
Net current-period other comprehensive income (loss) 8,908 1,067
Balance at End of Period $ (34,045) $ (42,953)