Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,827,231	$ 1,348,794	$ 1,212,287
Total other comprehensive loss	(45,734)	(19,784)	(23,951)
Balance at End of Period	1,110,899	1,827,231	1,348,794
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	92,452	95,342
Other comprehensive (loss) income before reclassifications	(3,951)	17,077
Amounts reclassified from other accumulated comprehensive income	(12,165)	(19,967)
Total other comprehensive loss	(16,116)	(2,890)
Balance at End of Period	76,336	92,452	95,342
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	(50,939)	(34,045)
Other comprehensive (loss) income before reclassifications	(32,806)	(16,894)
Amounts reclassified from other accumulated comprehensive income	3,188	0
Total other comprehensive loss	(29,618)	(16,894)
Balance at End of Period	$ (80,557)	$ (50,939)	$ (34,045)