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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenues:    
Net premiums earned $ 420,940 $ 378,829
Net investment income earned 32,870 32,628
Net realized gains:    
Net realized investment gains 5,304 4,779
Other-than-temporary impairments (1,919) (257)
Other-than-temporary impairments on fixed maturity securities recognized in other comprehensive income (30) (164)
Total net realized gains 3,355 4,358
Other income 2,784 3,533
Total revenues 459,949 419,348
Expenses:    
Loss and loss expense incurred 269,849 252,906
Policy acquisition costs 139,528 127,958
Interest expense 5,831 4,700
Other expenses 15,873 10,593
Total expenses 431,081 396,157
Income from continuing operations before federal income tax 28,868 23,191
Federal income tax expense (benefit):    
Current 7,453 7,178
Deferred (890) (2,080)
Total federal income tax expense 6,563 5,098
Net income from continuing operations 22,305 18,093
Loss on disposal of discontinued operations, net of tax $(538) (997) 0
Net income $ 21,308 $ 18,093
Earnings per share:    
Basic net income from continuing operations $ 0.40 $ 0.33
Basic net loss from discontinued operations $ (0.02) $ 0.00
Basic net income $ 0.38 $ 0.33
Diluted net income from continuing operations $ 0.40 $ 0.33
Diluted net loss from discontinued operations $ (0.02) $ 0.00
Diluted net income $ 0.38 $ 0.33
Dividends to stockholders $ 0.13 $ 0.13