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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenues:        
Net premiums earned $ 490,309 $ 463,625 $ 966,432 $ 920,120
Net investment income earned 32,230 36,774 59,147 72,308
Net realized (losses) gains:        
Net realized investment gains 1,031 4,958 22,008 13,139
Other-than-temporary impairments (4,451) (419) (6,545) (1,382)
Total net realized (losses) gains (3,420) 4,539 15,463 11,757
Other income 2,854 1,911 4,823 11,735
Total revenues 521,973 506,849 1,045,865 1,015,920
Expenses:        
Loss and loss expense incurred 291,561 297,795 576,560 618,341
Policy acquisition costs 169,770 155,173 334,493 304,439
Interest expense 5,490 5,425 10,969 10,986
Other expenses 8,387 8,935 20,788 17,549
Total expenses 475,208 467,328 942,810 951,315
Income before federal income tax 46,765 39,521 103,055 64,605
Federal income tax expense:        
Current 7,733 8,781 19,987 15,319
Deferred 5,264 1,399 9,592 1,971
Total federal income tax expense 12,997 10,180 29,579 17,290
Net income $ 33,768 $ 29,341 $ 73,476 $ 47,315
Earnings per share:        
Basic net income $ 0.59 $ 0.52 $ 1.29 $ 0.84
Diluted net income 0.58 0.51 1.27 0.83
Dividends to stockholders $ 0.14 $ 0.13 $ 0.28 $ 0.26