Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Net premiums earned	$ 940,941	$ 899,304	$ 2,783,682	$ 2,633,775
Net investment income	32,334	32,140	95,566	100,801
Net realized investment (losses) gains	(43,543)	64,436	56,953	(28,458)
Other	2,481	2,894	7,883	6,810
Total revenues	932,213	998,774	2,944,084	2,712,928
Expenses:
Losses and loss adjustment expenses	697,947	618,657	1,981,519	1,765,627
Policy acquisition costs	153,142	157,365	468,556	463,604
Other operating expenses	80,238	71,859	216,723	219,519
Interest	4,267	4,262	12,845	12,786
Total expenses	935,594	852,143	2,679,643	2,461,536
(Loss) income before income taxes	(3,381)	146,631	264,441	251,392
Income tax (benefit) expense	(4,669)	27,774	46,977	43,528
Net income	$ 1,288	$ 118,857	$ 217,464	$ 207,864
Net income per share:
Basic (in dollars per share)	$ 0.02	$ 2.15	$ 3.93	$ 3.75
Diluted (in dollars per share)	$ 0.02	$ 2.15	$ 3.93	$ 3.75
Weighted average shares outstanding:
Basic (in shares)	55,371	55,358	55,367	55,358
Diluted (in shares)	55,375	55,358	55,375	55,358