Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
REVENUES:
Net premiums written	$ 1,642,569	$ 1,543,925	$ 3,306,291	$ 3,119,327
Change in net unearned premiums	(82,776)	(50,884)	(219,163)	(154,273)
Net premiums earned	1,559,793	1,493,041	3,087,128	2,965,054
Net investment income	129,049	127,583	259,182	251,822
Insurance service fees	36,939	35,942	77,301	72,460
Net realized investment gains	6,315	27,557	31,772	46,601
Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount	0	0	(18,114)	0
Revenues from non-insurance businesses	123,764	105,596	225,544	198,202
Other income	54	46	312	305
Total revenues	1,855,914	1,789,765	3,663,125	3,534,444
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	964,162	906,235	1,886,483	1,806,943
Other operating costs and expenses	581,955	573,582	1,164,414	1,124,628
Expenses from non-insurance businesses	116,731	98,730	212,262	188,400
Interest expense	34,752	33,031	66,976	67,569
Total operating costs and expenses	1,697,600	1,611,578	3,330,135	3,187,540
Income before income taxes	158,314	178,187	332,990	346,904
Income tax expense	(49,408)	(55,138)	(103,837)	(105,411)
Net income before noncontrolling interests	108,906	123,049	229,153	241,493
Noncontrolling interests	61	(14)	(676)	(151)
Net income to common stockholders	$ 108,967	$ 123,035	$ 228,477	$ 241,342
NET INCOME PER SHARE:
Basic	$ 0.89	$ 0.99	$ 1.86	$ 1.93
Diluted	$ 0.85	$ 0.95	$ 1.78	$ 1.84