Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
REVENUES:
Net premiums written	$ 1,607,365	$ 1,571,037	$ 4,913,656	$ 4,690,364
Change in net unearned premiums	(21,421)	(39,479)	(240,584)	(193,752)
Net premiums earned	1,585,944	1,531,558	4,673,072	4,496,612
Net investment income	145,668	133,214	404,850	385,036
Insurance service fees	32,135	35,192	109,437	107,652
Net realized investment gains	175,738	66,419	207,508	113,020
Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount	0	12,515	(18,114)	12,515
Revenues from non-insurance businesses	80,242	107,059	305,787	305,261
Other income	0	30	0	335
Total revenues	2,019,727	1,860,957	5,682,540	5,395,401
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	965,856	926,355	2,852,339	2,733,298
Other operating costs and expenses	606,348	573,541	1,770,450	1,698,169
Expenses from non-insurance businesses	78,865	100,500	291,127	288,900
Interest expense	37,043	31,641	104,019	99,210
Total operating costs and expenses	1,688,112	1,632,037	5,017,935	4,819,577
Income before income taxes	331,615	228,920	664,605	575,824
Income tax expense	(110,952)	(76,184)	(214,789)	(181,595)
Net income before noncontrolling interests	220,663	152,736	449,816	394,229
Noncontrolling interests	(13)	(129)	(689)	(280)
Net income to common stockholders	$ 220,650	$ 152,607	$ 449,127	$ 393,949
NET INCOME PER SHARE:
Basic	$ 1.80	$ 1.24	$ 3.66	$ 3.17
Diluted	$ 1.72	$ 1.18	$ 3.50	$ 3.02