Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
REVENUES:
Net premiums written	$ 1,663,722	$ 1,575,402
Change in net unearned premiums	(136,387)	(103,389)
Net premiums earned	1,527,335	1,472,013
Net investment income	130,133	124,239
Insurance service fees	40,362	36,518
Net realized investment gains	25,457	19,044
Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount	(18,114)	0
Revenues from non-insurance businesses	101,780	92,606
Other income	258	259
Total revenues	1,807,211	1,744,679
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	922,321	900,708
Other operating costs and expenses	582,459	551,046
Expenses from non-insurance businesses	95,531	89,670
Interest expense	32,224	34,538
Total operating costs and expenses	1,632,535	1,575,962
Income before income taxes	174,676	168,717
Income tax expense	(54,428)	(50,273)
Net income before noncontrolling interests	120,248	118,444
Noncontrolling interests	(737)	(137)
Net income to common stockholders	$ 119,511	$ 118,307
NET INCOME PER SHARE:
Basic	$ 0.97	$ 0.94
Diluted	$ 0.93	$ 0.89