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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues:      
Net premiums earned $ 2,291,027 $ 2,149,572 $ 1,989,909
Net investment income earned 161,882 130,754 121,316
Net realized gains (losses):      
Net realized investment gains 11,204 3,562 31,537
Other-than-temporary impairments (4,809) (8,509) (18,366)
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income (36) 10 0
Total net realized gains (losses) 6,359 (4,937) 13,171
Other income 10,716 8,881 7,456
Total revenues 2,469,984 2,284,270 2,131,852
Expenses:      
Loss and loss expense incurred 1,345,074 1,234,797 1,148,541
Amortization of deferred policy acquisition costs 469,236 450,328 399,436
Other insurance expenses 333,097 321,395 300,359
Interest expense 24,354 22,771 22,428
Corporate expenses 36,255 35,024 28,396
Total expenses 2,208,016 2,064,315 1,899,160
Income before federal income tax 261,968 219,955 232,692
Federal income tax expense:      
Current 62,184 48,581 45,347
Deferred 30,958 12,879 21,484
Total federal income tax expense 93,142 61,460 66,831
Net income $ 168,826 $ 158,495 $ 165,861
Earnings per share:      
Basic net income $ 2.89 $ 2.74 $ 2.90
Diluted net income 2.84 2.70 2.85
Dividends to stockholders $ 0.66 $ 0.61 $ 0.57