Segment Reporting - Revenue and Other Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net premiums earned	$ 1,037,183	$ 1,115,321	$ 1,145,349
Services revenue	125,825	105,385	154,596
Net investment income	147,909	154,037	171,796
Net gains on investments and other financial instruments	15,603	60,277	51,719
Other income	3,412	3,597	3,495
Total revenues	1,329,932	1,438,617	1,526,955
Interest expense	84,344	71,150	56,310
Allocation of corporate operating expenses	147,386	129,870	124,412
Inter-segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net premiums earned	0	0	0
Services revenue	(281)	(1,439)	(1,440)
Net investment income	0	0	0
Net gains on investments and other financial instruments	0	0	0
Other income	0	0	0
Total revenues	(281)	(1,439)	(1,440)
Adjustments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net premiums earned	0	0	0
Services revenue	0	0	0
Net investment income	0	0	0
Net gains on investments and other financial instruments	14,094	60,277	51,719
Other income	0	247	0
Total revenues	14,094	60,524	51,719
Mortgage
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net premiums earned	998,282	1,092,767	1,134,214
Services revenue	17,670	14,765	8,134
Net investment income	132,929	137,195	151,491
Net gains on investments and other financial instruments	0	0	0
Other income	2,678	2,816	2,798
Total revenues	1,151,559	1,247,543	1,296,637
Interest expense	84,344	71,150	56,310
Direct depreciation expense	9,580	12,387	15,323
Allocation of corporate operating expenses	127,482	114,802	104,078
Mortgage | Depreciation Expense
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Allocation of corporate operating expenses	3,200	2,600	1,600
homegenius
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net premiums earned	38,901	22,554	11,976
Services revenue	108,282	79,524	76,941
Net investment income	358	361	680
Net gains on investments and other financial instruments	1,509	0	0
Other income	0	0	0
Total revenues	149,050	102,439	89,597
Interest expense	0	0	0
Direct depreciation expense	2,452	2,857	2,321
Allocation of corporate operating expenses	18,482	12,807	10,165
homegenius | Depreciation Expense
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Allocation of corporate operating expenses	500	300	100
Reportable Segment Total | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net premiums earned	1,037,183	1,115,321	1,146,190
Services revenue	125,952	94,289	85,075
Net investment income	133,287	137,556	152,171
Net gains on investments and other financial instruments	1,509	0	0
Other income	2,678	2,816	2,798
Total revenues	1,300,609	1,349,982	1,386,234
Interest expense	84,344	71,150	56,310
Direct depreciation expense	12,032	15,244	17,644
Allocation of corporate operating expenses	145,964	127,609	114,243
Reportable Segment Total | Operating Segments | Depreciation Expense
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Allocation of corporate operating expenses	3,700	2,900	1,700
All Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net premiums earned	0	0	(841)
Services revenue	154	12,535	70,961
Net investment income	14,622	16,481	19,625
Net gains on investments and other financial instruments	0	0	0
Other income	734	534	697
Total revenues	$ 15,510	$ 29,550	$ 90,442