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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenues:        
Net premiums earned $ 572,055 $ 542,429 $ 1,700,939 $ 1,596,819
Net investment income earned 40,446 33,375 119,295 95,326
Net realized gains:        
Net realized investment gains 6,871 4,030 12,252 7,233
Other-than-temporary impairments (43) (342) (4,729) (4,494)
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income (30) 0 (36) 10
Total net realized gains 6,798 3,688 7,487 2,749
Other income 1,994 2,199 8,526 7,018
Total revenues 621,293 581,691 1,836,247 1,701,912
Expenses:        
Losses and loss expenses incurred 344,587 316,258 1,003,618 911,881
Policy acquisition costs 194,635 193,835 587,687 567,793
Interest expense 6,085 5,714 18,272 16,940
Other expenses 8,671 10,441 32,852 35,669
Total expenses 553,978 526,248 1,642,429 1,532,283
Income before federal income tax 67,315 55,443 193,818 169,629
Federal income tax expense:        
Current 16,859 5,625 48,917 38,027
Deferred 3,738 11,316 6,317 12,467
Total federal income tax expense 20,597 16,941 55,234 50,494
Net income $ 46,718 $ 38,502 $ 138,584 $ 119,135
Earnings per share:        
Basic net income $ 0.80 $ 0.66 $ 2.37 $ 2.06
Diluted net income 0.79 0.66 2.34 2.03
Dividends to stockholders $ 0.16 $ 0.15 $ 0.48 $ 0.45