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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenues:    
Net premiums earned $ 560,854 $ 522,458
Net investment income earned 37,419 30,769
Net realized losses:    
Net realized investment gains 2,430 889
Other-than-temporary impairments (3,475) (3,593)
Total net realized losses (1,045) (2,704)
Other income 3,241 951
Total revenues 600,469 551,474
Expenses:    
Losses and loss expenses incurred 317,472 297,144
Policy acquisition costs 196,228 183,227
Interest expense 6,106 5,606
Other expenses 13,089 13,622
Total expenses 532,895 499,599
Income before federal income tax 67,574 51,875
Federal income tax expense:    
Current 14,273 14,084
Deferred 2,861 759
Total federal income tax expense 17,134 14,843
Net income $ 50,440 $ 37,032
Earnings per share:    
Basic net income $ 0.87 $ 0.64
Diluted net income 0.85 0.63
Dividends to stockholders $ 0.16 $ 0.15