Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
REVENUES:
Net premiums written	$ 1,525,880	$ 1,376,966
Change in net unearned premiums	(162,268)	(144,847)
Net premiums earned	1,363,612	1,232,119
Net investment income	168,711	135,929
Insurance service fees	28,703	26,736
Net investment gains	52,754	19,969
Revenues from wholly-owned investees	92,840	91,735
Other income	286	281
Total revenues	1,706,906	1,506,769
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	822,095	744,679
Other operating costs and expenses	515,166	481,604
Expenses from wholly-owned investees	91,730	89,152
Interest expense	30,330	31,111
Total operating costs and expenses	1,459,321	1,346,546
Income before income taxes	247,585	160,223
Income tax expense	(77,901)	(43,625)
Net income before noncontrolling interests	169,684	116,598
Noncontrolling interests	(11)	17
Net income to common stockholders	$ 169,673	$ 116,615
NET INCOME PER SHARE:
Basic	$ 1.31	$ 0.86
Diluted	$ 1.25	$ 0.83