Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Net premiums earned	$ 899,304	$ 915,012	$ 2,633,775	$ 2,674,034
Net investment income	32,140	36,356	100,801	105,562
Net realized investment gains (losses)	64,436	33,324	(28,458)	197,726
Other	2,894	2,603	6,810	7,203
Total revenues	998,774	987,295	2,712,928	2,984,525
Expenses:
Losses and loss adjustment expenses	618,657	680,928	1,765,627	1,967,921
Policy acquisition costs	157,365	150,929	463,604	447,971
Other operating expenses	71,859	70,341	219,519	206,250
Interest	4,262	4,257	12,786	12,779
Total expenses	852,143	906,455	2,461,536	2,634,921
Income before income taxes	146,631	80,840	251,392	349,604
Income tax expense	27,774	11,558	43,528	61,205
Net income	$ 118,857	$ 69,282	$ 207,864	$ 288,399
Net income per share:
Basic (in dollars per share)	$ 2.15	$ 1.25	$ 3.75	$ 5.21
Diluted (in dollars per share)	$ 2.15	$ 1.25	$ 3.75	$ 5.21
Weighted average shares outstanding:
Basic (in shares)	55,358	55,355	55,358	55,349
Diluted (in shares)	55,358	55,366	55,358	55,360