CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Premiums written:
Direct	$ 1,105,027	$ 1,108,570	$ 1,123,117
Assumed	12,835	8,535	8,924
Ceded	(202,821)	(156,373)	(163,031)
Net premiums written	915,041	960,732	969,010
Decrease (increase) in unearned premiums	37,510	46,401	45,409
Net premiums earned	952,551	1,007,133	1,014,419
Investment income, net of expenses	214,740	167,476	156,438
Net gains (losses) on investments and other financial instruments	(14,141)	(7,463)	5,861
Other revenue	1,952	5,639	8,957
Total revenues	1,155,102	1,172,785	1,185,675
Losses and expenses:
Losses incurred, net	(20,856)	(254,565)	64,577
Amortization of deferred insurance policy acquisition costs	10,820	12,366	12,602
Other underwriting and operating expenses, net	226,004	236,697	198,445
Loss on debt extinguishment	0	40,199	36,914
Interest expense	36,905	48,054	71,360
Total losses and expenses	252,873	82,751	383,898
Income before tax	902,229	1,090,034	801,777
Provision for income taxes	189,280	224,685	166,794
Net income	$ 712,949	$ 865,349	$ 634,983
Earnings per share:
Basic (in dollars per share)	$ 2.51	$ 2.83	$ 1.90
Diluted (in dollars per share)	$ 2.49	$ 2.79	$ 1.85
Weighted average common shares outstanding - basic (in shares)	283,605	305,847	334,330
Weighted average common shares outstanding - diluted (in shares)	287,155	311,229	351,308