Commitments and Contingencies - Activity of Representation and Warranties Reserve (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Representation And Warranty Reserve [Roll Forward]
Balance, beginning of period	$ 84,052	$ 69,297	$ 86,762	$ 69,542
Reserve charged to operations	7,762	9,818
Losses realized, net	(10,472)	(10,063)
Balance, end of period	$ 84,052	$ 69,297