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Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net premiums earned	$ 668,359	$ 653,620	$ 642,619	$ 632,573	$ 625,288	$ 614,277	$ 604,836	$ 591,828	$ 2,597,171	$ 2,436,229	$ 2,291,027
Net investment income earned	57,594	55,826	58,505	50,618	54,109	52,443	45,553	43,231	222,543	195,336	161,882
Net realized and unrealized gains (losses)	(873)	(2,183)	4,027	13,451	(37,935)	(4,787)	(1,652)	(10,549)	14,422	(54,923)	6,359
Other income	3,820	3,162	3,053	2,320	1,542	2,538	3,179	2,179	12,355	9,438	10,716
Total revenues	728,900	710,425	708,204	698,962	643,004	664,471	651,916	626,689	2,846,491	2,586,080	2,469,984
Income before federal income tax	101,293	71,178	90,225	73,694	52,135	67,130	72,525	19,931	336,390	211,721	261,968
Net income	$ 81,859	$ 56,150	$ 72,266	$ 61,348	$ 45,760	$ 55,435	$ 58,819	$ 18,925	$ 271,623	$ 178,939	$ 168,826
Basic net income per share	$ 1.38	$ 0.94	$ 1.22	$ 1.04	$ 0.77	$ 0.94	$ 1.00	$ 0.32	$ 4.57	$ 3.04	$ 2.89
Diluted net income per share	$ 1.36	$ 0.93	$ 1.21	$ 1.02	$ 0.76	$ 0.93	$ 0.99	$ 0.32	$ 4.53	$ 3.00	$ 2.84

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