Segment Reporting - Adjusted Pretax Operating Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net gains on investments and other financial instruments	$ 15,603	$ 60,277	$ 51,719
Loss on extinguishment of debt	0	0	(22,738)
Impairment of goodwill	0	0	(4,828)
Amortization and impairment of other acquired intangible assets	(3,450)	(5,144)	(22,288)
Impairment of other long-lived assets and other non-operating items	(3,561)	(7,759)	(7,507)
Consolidated pretax income	764,832	479,441	848,993
Corporate, non-segment
Segment Reporting Information [Line Items]
Adjusted pretax operating income (loss)	3,527	2,013	19,768
Adjustments
Segment Reporting Information [Line Items]
Net gains on investments and other financial instruments	14,094	60,277	51,719
Mortgage
Segment Reporting Information [Line Items]
Adjusted pretax operating income (loss)	781,546	453,294	852,854
Net gains on investments and other financial instruments	0	0	0
homegenius
Segment Reporting Information [Line Items]
Adjusted pretax operating income (loss)	(27,324)	(23,240)	(17,987)
Net gains on investments and other financial instruments	1,509	0	0
Impairment of goodwill	0		(4,800)
Mortgage and homegenius segment
Segment Reporting Information [Line Items]
Adjusted pretax operating income (loss)	$ 754,222	$ 430,054	$ 834,867