Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
REVENUES:
Net premiums written	$ 1,749,906	$ 1,624,214	$ 5,202,971	$ 4,913,656
Change in net unearned premiums	(73,096)	(20,729)	(286,464)	(161,709)
Net premiums earned	1,676,810	1,603,485	4,916,507	4,751,947
Net investment income	161,692	186,124	508,279	514,419
Net realized and unrealized gains on investments	1,465	22,334	143,691	140,429
Revenues from non-insurance businesses	101,880	95,168	283,005	242,037
Insurance service fees	23,681	30,782	71,440	91,175
Other income	188	9	3,200	59
Total revenues	1,965,716	1,937,902	5,926,122	5,740,066
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	1,041,471	1,017,720	3,058,950	2,954,575
Other operating costs and expenses	581,045	577,648	1,760,961	1,781,230
Expenses from non-insurance businesses	101,743	93,463	280,141	238,198
Interest expense	38,475	39,848	119,913	116,608
Total operating costs and expenses	1,762,734	1,728,679	5,219,965	5,090,611
Income before income taxes	202,982	209,223	706,157	649,455
Income tax expense	(37,831)	(44,780)	(141,965)	(136,661)
Net income before noncontrolling interests	165,151	164,443	564,192	512,794
Noncontrolling interests	57	(2,523)	(1,554)	(4,402)
Net income to common stockholders	$ 165,208	$ 161,920	$ 562,638	$ 508,392
NET INCOME PER SHARE:
Basic (in dollar per share)	$ 0.87	$ 0.85	$ 2.95	$ 2.68
Diluted (in dollar per share)	$ 0.85	$ 0.84	$ 2.91	$ 2.64