Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
REVENUES:
Net premiums written	$ 1,709,601	$ 1,665,338
Change in net unearned premiums	(116,745)	(97,930)
Net premiums earned	1,592,856	1,567,408
Net investment income	158,254	174,518
Net realized and unrealized gains on investments	68,653	48,464
Revenues from non-insurance businesses	91,827	70,171
Insurance service fees	25,312	30,675
Other income	120	11
Total revenues	1,937,022	1,891,247
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	988,650	963,219
Other operating costs and expenses	588,087	610,439
Expenses from non-insurance businesses	90,125	69,543
Interest expense	40,721	37,056
Total operating costs and expenses	1,707,583	1,680,257
Income before income taxes	229,439	210,990
Income tax expense	(47,825)	(43,417)
Net income before noncontrolling interests	181,614	167,573
Noncontrolling interests	(892)	(1,177)
Net income to common stockholders	$ 180,722	$ 166,396
NET INCOME PER SHARE:
Basic (in dollar per share)	$ 0.95	$ 0.88
Diluted (in dollar per share)	$ 0.94	$ 0.87