Consolidated Statements Of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Net premiums earned	$ 3,741,948	$ 3,555,635	$ 3,599,418
Net investment income	129,727	134,858	141,263
Net realized investment gains	111,658	85,731	222,793
Other	10,024	8,287	9,044
Total revenues	3,993,357	3,784,511	3,972,518
Expenses:
Losses and loss adjustment expenses	2,760,155	2,395,343	2,706,024
Policy acquisition costs	633,385	627,788	602,085
Other operating expenses	283,397	285,831	269,305
Interest	17,113	17,048	17,035
Total expenses	3,694,050	3,326,010	3,594,449
Income before income taxes	299,307	458,501	378,069
Income tax expense	51,370	83,894	57,982
Net income	$ 247,937	$ 374,607	$ 320,087
Net income per share:
Basic (in dollars per share)	$ 4.48	$ 6.77	$ 5.78
Diluted (in dollars per share)	$ 4.48	$ 6.77	$ 5.78