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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues:      
Net premiums earned $ 2,681,814 $ 2,597,171 $ 2,436,229
Net investment income earned 227,107 222,543 195,336
Net realized and unrealized investment (losses) gain (4,217) 14,422 (54,923)
Other income 17,570 12,355 9,438
Total revenues 2,922,274 2,846,491 2,586,080
Expenses:      
Loss and loss expense incurred 1,635,823 1,551,491 1,498,134
Amortization of deferred policy acquisition costs 560,271 535,973 495,042
Other insurance expenses 366,941 358,069 331,318
Interest expense 30,839 33,668 24,419
Corporate expenses 25,412 30,900 25,446
Total expenses 2,619,286 2,510,101 2,374,359
Income before federal income tax 302,988 336,390 211,721
Federal income tax expense:      
Current 60,059 60,640 35,012
Deferred (3,426) 4,127 (2,230)
Total federal income tax expense 56,633 64,767 32,782
Net income 246,355 271,623 178,939
Preferred stock dividends 0 0 0
Net Income available to common stockholders $ 246,355 $ 271,623 $ 178,939
Earnings per common share:      
Net income available to common stockholders - Basic (in dollars per share) $ 4.12 $ 4.57 $ 3.04
Net income available to common stockholders - Diluted (in dollars per share) $ 4.09 $ 4.53 $ 3.00