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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenues:        
Net premiums earned $ 542,429 $ 507,390 $ 1,596,819 $ 1,473,822
Net investment income earned 33,375 32,061 95,326 91,208
Net realized gains:        
Net realized investment gains 4,030 1,590 7,233 23,598
Other-than-temporary impairments (342) (1,282) (4,494) (7,827)
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income 0 0 10 0
Total net realized gains 3,688 308 2,749 15,771
Other income 2,199 698 7,018 5,521
Total revenues 581,691 540,457 1,701,912 1,586,322
Expenses:        
Loss and loss expense incurred 316,258 285,161 911,881 861,721
Policy acquisition costs 193,835 174,802 567,793 509,295
Interest expense 5,714 5,610 16,940 16,826
Other expenses 10,441 9,045 35,669 29,586
Total expenses 526,248 474,618 1,532,283 1,417,428
Income before federal income tax 55,443 65,839 169,629 168,894
Federal income tax expense:        
Current 5,625 9,141 38,027 29,128
Deferred 11,316 9,702 12,467 19,294
Total federal income tax expense 16,941 18,843 50,494 48,422
Net income $ 38,502 $ 46,996 $ 119,135 $ 120,472
Earnings per share:        
Basic net income $ 0.66 $ 0.82 $ 2.06 $ 2.11
Diluted net income 0.66 0.81 2.03 2.08
Dividends to stockholders $ 0.15 $ 0.14 $ 0.45 $ 0.42