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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenues:    
Net premiums earned $ 378,829 $ 351,343
Net investment income earned 32,628 43,473
Net realized gains (losses):    
Net realized investment gains 4,779 6,390
Other-than-temporary impairments (257) (532)
Other-than-temporary impairments on fixed maturity securities recognized in other comprehensive income (164) (98)
Total net realized gains 4,358 5,760
Other income 3,533 2,880
Total revenues 419,348 403,456
Expenses:    
Losses and loss expenses incurred 252,906 249,206
Policy acquisition costs 127,958 115,044
Interest expense 4,700 4,557
Other expenses 10,593 8,491
Total expenses 396,157 377,298
Income before federal income tax 23,191 26,158
Federal income tax expense (benefit):    
Current 7,178 4,276
Deferred (2,080) 1,382
Total federal income tax expense 5,098 5,658
Net income $ 18,093 $ 20,500
Earnings per share:    
Basic net income $ 0.33 $ 0.38
Diluted net income $ 0.33 $ 0.37
Dividends to stockholders $ 0.13 $ 0.13