Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
REVENUES:
Net premiums written	$ 1,489,776	$ 1,341,898	$ 3,015,656	$ 2,718,864
Change in net unearned premiums	(72,131)	(59,383)	(234,399)	(204,230)
Net premiums earned	1,417,645	1,282,515	2,781,257	2,514,634
Net investment income	138,729	143,737	307,440	279,666
Insurance service fees	26,922	27,652	55,625	54,388
Net investment gains	109,168	33,058	161,922	53,027
Revenues from wholly-owned investees	104,285	83,775	197,125	175,510
Other income	240	225	526	506
Total revenues	1,796,989	1,570,962	3,503,895	3,077,731
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	867,778	805,470	1,689,873	1,550,149
Other operating costs and expenses	534,150	494,286	1,049,316	975,890
Expenses from wholly-owned investees	101,296	81,293	193,026	170,445
Interest expense	30,311	31,207	60,641	62,318
Total operating costs and expenses	1,533,535	1,412,256	2,992,856	2,758,802
Income before income taxes	263,454	158,706	511,039	318,929
Income tax expense	(83,277)	(43,579)	(161,178)	(87,204)
Net income before noncontrolling interests	180,177	115,127	349,861	231,725
Noncontrolling interests	(216)	830	(227)	847
Net income to common stockholders	$ 179,961	$ 115,957	$ 349,634	$ 232,572
NET INCOME PER SHARE:
Basic	$ 1.41	$ 0.85	$ 2.72	$ 1.71
Diluted	$ 1.35	$ 0.82	$ 2.60	$ 1.65