Condensed Consolidated Statements of Income - Unaudited - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Direct premiums	$ 762,227	$ 702,637
Ceded premiums	(395,973)	(386,825)
Net premiums	366,254	315,812
Commissions and fees	234,044	190,069
Investment income net of investment expenses	35,198	28,892
Interest expense on surplus note	(15,146)	(13,472)
Net investment income	20,052	15,420
Realized investment gains (losses)	1,766	(10,030)
Other, net	15,595	13,665
Revenues	637,711	524,936
Benefits and expenses:
Benefits and claims	183,789	134,813
Amortization of deferred policy acquisition costs	66,105	70,311
Sales commissions	121,894	96,607
Insurance expenses	48,766	48,709
Insurance commissions	8,740	6,844
Interest expense	7,145	7,192
Other operating expenses	72,963	65,914
Total benefits and expenses	509,402	430,390
Income before income taxes	128,309	94,546
Income taxes	30,437	22,077
Net income	$ 97,872	$ 72,469
Earnings per share:
Basic earnings per share	$ 2.47	$ 1.75
Diluted earnings per share	$ 2.46	$ 1.75
Weighted-average shares used in computing earnings per share:
Basic	39,456	41,131
Diluted	39,581	41,239
Supplemental disclosures:
Total impairment losses	$ 154	$ 3,701
Other net realized investment gains (losses)	496	343
Net gains (losses) recognized on equity securities	1,424	(6,672)
Net realized investment gains (losses)	$ 1,766	$ (10,030)