Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
REVENUES:
Net premiums written	$ 1,624,214	$ 1,571,183	$ 4,913,656	$ 4,782,272
Change in net unearned premiums	(20,729)	10,317	(161,709)	(62,028)
Net premiums earned	1,603,485	1,581,500	4,751,947	4,720,244
Net investment income	186,124	142,479	514,419	426,601
Net realized and unrealized gains on investments	22,334	183,959	140,429	276,760
Revenues from non-insurance businesses	95,168	89,786	242,037	225,033
Insurance service fees	30,782	33,612	91,175	100,475
Other income	9	6	59	695
Total revenues	1,937,902	2,031,342	5,740,066	5,749,808
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	1,017,720	1,081,174	2,954,575	3,025,475
Other operating costs and expenses	577,648	600,822	1,781,230	1,821,155
Expenses from non-insurance businesses	93,463	86,412	238,198	221,389
Interest expense	39,848	36,821	116,608	110,419
Total operating costs and expenses	1,728,679	1,805,229	5,090,611	5,178,438
Income before income taxes	209,223	226,113	649,455	571,370
Income tax expense	(44,780)	(63,295)	(136,661)	(174,305)
Net income before noncontrolling interests	164,443	162,818	512,794	397,065
Noncontrolling interests	(2,523)	(764)	(4,402)	(2,560)
Net income to common stockholders	$ 161,920	$ 162,054	$ 508,392	$ 394,505
NET INCOME PER SHARE:
Basic (in dollar per share)	$ 1.28	$ 1.29	$ 4.02	$ 3.17
Diluted (in dollar per share)	$ 1.26	$ 1.26	$ 3.96	$ 3.05