Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
REVENUES:
Net premiums written	$ 1,624,104	$ 1,564,251	$ 3,289,442	$ 3,211,089
Change in net unearned premiums	(43,051)	4,452	(140,981)	(72,345)
Net premiums earned	1,581,053	1,568,703	3,148,461	3,138,744
Net investment income	153,777	135,264	328,295	284,123
Net realized and unrealized gains on investments	69,631	40,453	118,095	92,801
Revenues from non-insurance businesses	76,698	69,857	146,869	135,247
Insurance service fees	29,719	33,584	60,393	66,864
Other income	38	188	50	688
Total revenues	1,910,916	1,848,049	3,802,163	3,718,467
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	973,636	964,698	1,936,856	1,944,302
Other operating costs and expenses	593,142	616,632	1,203,581	1,220,332
Expenses from non-insurance businesses	75,191	68,959	144,734	134,978
Interest expense	39,705	36,799	76,760	73,597
Total operating costs and expenses	1,681,674	1,687,088	3,361,931	3,373,209
Income before income taxes	229,242	160,961	440,232	345,258
Income tax expense	(48,464)	(51,388)	(91,881)	(111,011)
Net income before noncontrolling interests	180,778	109,573	348,351	234,247
Noncontrolling interests	(703)	(569)	(1,879)	(1,796)
Net income to common stockholders	$ 180,075	$ 109,004	$ 346,472	$ 232,451
NET INCOME PER SHARE:
Basic (in dollar per share)	$ 1.42	$ 0.87	$ 2.74	$ 1.88
Diluted (in dollar per share)	$ 1.40	$ 0.85	$ 2.70	$ 1.81