Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Net premiums earned	$ 926,820	$ 811,898	$ 1,842,741	$ 1,734,471
Net investment income	30,953	34,166	63,232	68,661
Net realized investment gains (losses)	58,805	158,426	100,496	(92,894)
Other	2,197	1,353	5,402	3,915
Total revenues	1,018,775	1,005,843	2,011,871	1,714,153
Expenses:
Losses and loss adjustment expenses	657,228	495,300	1,283,572	1,146,970
Policy acquisition costs	150,984	149,706	315,414	306,240
Other operating expenses	70,927	71,103	136,485	147,660
Interest	4,235	4,268	8,577	8,523
Total expenses	883,374	720,377	1,744,048	1,609,393
Income before income taxes	135,401	285,466	267,823	104,760
Income tax expense	26,220	57,255	51,647	15,753
Net income	$ 109,181	$ 228,211	$ 216,176	$ 89,007
Net income per share:
Basic (in dollars per share)	$ 1.97	$ 4.12	$ 3.90	$ 1.61
Diluted (in dollars per share)	$ 1.97	$ 4.12	$ 3.90	$ 1.61
Weighted average shares outstanding:
Basic (in shares)	55,371	55,358	55,366	55,358
Diluted (in shares)	55,376	55,358	55,375	55,358