Income Taxes - Reconciliation of Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Reconciliation of statutory tax to effective tax
Federal statutory tax rate	$ 105,230	$ 81,118	$ 115,535
REIT and other non-taxable income	(92,121)	(58,265)	(106,301)
State income taxes	4,307	7,509	3,034
Federal benefit of state tax deduction	(905)	(1,577)	(637)
Net operating loss carryback rate differential	0	(3,387)	0
Intra-entity transfers	(6,635)	(5,385)	0
Other	(1,207)	184	1,601
Effective tax rate	$ 8,669	$ 20,197	$ 13,232
Reconciliation of statutory tax rate to effective tax rate
Federal statutory tax rate	21.00%	21.00%	21.00%	35.00%
REIT and other non-taxable income	(18.40%)	(15.10%)	(19.30%)
State income taxes	0.90%	1.90%	0.50%
Federal benefit of state tax deduction	(0.20%)	(0.40%)	(0.10%)
Net operating loss carryback rate differential	0.00%	(0.90%)	0.00%
Intra-entity transfers	(1.30%)	(1.40%)	0.00%
Other	(0.30%)	0.10%	0.30%
Effective tax rate	1.70%	5.20%	2.40%