Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ 1,386,087	$ 1,110,899
Total other comprehensive (loss) income	(17,547)	9,209
Balance at End of Period	1,445,266	1,215,575
Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	67,503	76,336
Other comprehensive (loss) income before reclassifications	(17,873)	10,986
Amounts reclassified from other accumulated comprehensive (income) loss	(692)	(2,795)
Total other comprehensive (loss) income	(18,565)	8,191
Balance at End of Period	48,938	84,527
Interest Rate Agreements Accounted for as Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(76,430)	(80,557)
Other comprehensive (loss) income before reclassifications	0	0
Amounts reclassified from other accumulated comprehensive (income) loss	1,018	1,018
Total other comprehensive (loss) income	1,018	1,018
Balance at End of Period	$ (75,412)	$ (79,539)