Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
REVENUES:
Net premiums written	$ 1,575,402	$ 1,525,880
Change in net unearned premiums	(103,389)	(162,268)
Net premiums earned	1,472,013	1,363,612
Net investment income	124,239	168,711
Insurance service fees	36,518	28,703
Net realized investment gains	19,044	52,754
Revenues from wholly-owned investees	92,606	92,840
Other income	259	286
Total revenues	1,744,679	1,706,906
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	900,708	822,095
Other operating costs and expenses	551,046	515,166
Expenses from wholly-owned investees	89,670	91,730
Interest expense	34,538	30,330
Total operating costs and expenses	1,575,962	1,459,321
Income before income taxes	168,717	247,585
Income tax expense	(50,273)	(77,901)
Net income before noncontrolling interests	118,444	169,684
Noncontrolling interests	(137)	(11)
Net income to common stockholders	$ 118,307	$ 169,673
NET INCOME PER SHARE:
Basic	$ 0.94	$ 1.31
Diluted	$ 0.89	$ 1.25