Consolidated Statements Of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Net premiums earned	$ 2,957,897	$ 2,796,195	$ 2,698,187
Net investment income	126,299	125,723	124,538
Net realized investment (losses) gains	(83,807)	81,184	(11,422)
Other	8,911	8,671	9,738
Total revenues	3,009,300	3,011,773	2,821,041
Expenses:
Losses and loss adjustment expenses	2,145,495	1,986,122	1,962,690
Policy acquisition costs	539,231	526,208	505,517
Other operating expenses	250,839	249,381	219,478
Interest	3,168	2,637	1,260
Total expenses	2,938,733	2,764,348	2,688,945
Income before income taxes	70,567	247,425	132,096
Income tax (benefit) expense	(3,912)	69,476	19,953
Net income	$ 74,479	$ 177,949	$ 112,143
Net income per share:
Basic (in dollars per share)	$ 1.35	$ 3.23	$ 2.04
Diluted (in dollars per share)	$ 1.35	$ 3.23	$ 2.04