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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues:        
Net premiums earned $ 568,030 $ 531,932 $ 1,128,884 $ 1,054,390
Net investment income earned 41,430 31,182 78,849 61,951
Net realized gains (losses):        
Net realized investment gains 2,951 2,314 5,381 3,203
Other-than-temporary impairments (1,211) (559) (4,686) (4,152)
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income (6) 10 (6) 10
Total net realized gains (losses) 1,734 1,765 689 (939)
Other income 3,291 3,868 6,532 4,819
Total revenues 614,485 568,747 1,214,954 1,120,221
Expenses:        
Losses and loss expenses incurred 341,559 298,479 659,031 595,623
Policy acquisition costs 196,824 190,731 393,052 373,958
Interest expense 6,081 5,620 12,187 11,226
Other expenses 11,092 11,606 24,181 25,228
Total expenses 555,556 506,436 1,088,451 1,006,035
Income before federal income tax 58,929 62,311 126,503 114,186
Federal income tax expense:        
Current 17,785 18,318 32,058 32,402
Deferred (282) 392 2,579 1,151
Total federal income tax expense 17,503 18,710 34,637 33,553
Net income $ 41,426 $ 43,601 $ 91,866 $ 80,633
Earnings per share:        
Basic net income $ 0.71 $ 0.75 $ 1.57 $ 1.40
Diluted net income 0.70 0.74 1.55 1.38
Dividends to stockholders $ 0.16 $ 0.15 $ 0.32 $ 0.30