Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
REVENUES:
Net premiums written	$ 1,543,925	$ 1,489,776	$ 3,119,327	$ 3,015,656
Change in net unearned premiums	(50,884)	(72,131)	(154,273)	(234,399)
Net premiums earned	1,493,041	1,417,645	2,965,054	2,781,257
Net investment income	127,583	138,729	251,822	307,440
Insurance service fees	35,942	26,922	72,460	55,625
Net realized investment gains	27,557	109,168	46,601	161,922
Revenues from wholly-owned investees	105,596	104,285	198,202	197,125
Other income	46	240	305	526
Total revenues	1,789,765	1,796,989	3,534,444	3,503,895
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	906,235	867,778	1,806,943	1,689,873
Other operating costs and expenses	573,582	534,150	1,124,628	1,049,316
Expenses from wholly-owned investees	98,730	101,296	188,400	193,026
Interest expense	33,031	30,311	67,569	60,641
Total operating costs and expenses	1,611,578	1,533,535	3,187,540	2,992,856
Income before income taxes	178,187	263,454	346,904	511,039
Income tax expense	(55,138)	(83,277)	(105,411)	(161,178)
Net income before noncontrolling interests	123,049	180,177	241,493	349,861
Noncontrolling interests	(14)	(216)	(151)	(227)
Net income to common stockholders	$ 123,035	$ 179,961	$ 241,342	$ 349,634
NET INCOME PER SHARE:
Basic	$ 0.99	$ 1.41	$ 1.93	$ 2.72
Diluted	$ 0.95	$ 1.35	$ 1.84	$ 2.60