Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Net premiums earned (Note 8)	$ 1,037,183	$ 1,115,321	$ 1,145,349
Services revenue (Note 4)	125,825	105,385	154,596
Net investment income (Note 6)	147,909	154,037	171,796
Net gains on investments and other financial instruments (includes net realized gains on investments of $20,842, $35,826 and $10,843)	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
Expenses
Provision for losses	20,877	485,117	132,031
Policy acquisition costs	29,029	30,989	25,314
Cost of services	103,714	86,066	108,324
Other operating expenses	323,686	280,710	306,129
Interest expense	84,344	71,150	56,310
Loss on extinguishment of debt (Note 12)	0	0	22,738
Impairment of goodwill (Note 7)	0	0	4,828
Amortization and impairment of other acquired intangible assets	3,450	5,144	22,288
Total expenses	565,100	959,176	677,962
Pretax income	764,832	479,441	848,993
Income tax provision (Note 10)	164,161	85,815	176,684
Net income	$ 600,671	$ 393,626	$ 672,309
Net Income Per Share
Net income per share, basic (in usd per share)	$ 3.19	$ 2.01	$ 3.22
Net income per share, diluted (in usd per share)	$ 3.16	$ 2.00	$ 3.20
Weighted-average number of common shares outstanding—basic (in shares)	188,370	195,443	208,773
Weighted-average number of common and common equivalent shares outstanding—diluted (in shares)	190,263	196,642	210,340