Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Net premiums earned	$ 2,698,187	$ 2,574,920	$ 2,566,057
Net investment income	124,538	131,896	140,947
Net realized investment (losses) gains	(11,422)	66,380	58,397
Other	9,738	10,174	11,884
Total revenues	2,821,041	2,783,370	2,777,285
Expenses:
Losses and loss adjustment expenses	1,962,690	1,961,448	1,829,205
Policy acquisition costs	505,517	477,788	481,721
Other operating expenses	219,478	207,281	215,711
Other operating expenses	1,260	1,543	5,549
Total expenses	2,688,945	2,648,060	2,532,186
Income before income taxes	132,096	135,310	245,099
Income tax expense	19,953	18,399	53,935
Net income	$ 112,143	$ 116,911	$ 191,164
Net income per share:
Basic (in dollars per share)	$ 2.04	$ 2.13	$ 3.49
Diluted (in dollars per share)	$ 2.04	$ 2.13	$ 3.49