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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues:      
Net premiums earned $ 2,597,171 $ 2,436,229 $ 2,291,027
Net investment income earned 222,543 195,336 161,882
Net realized and unrealized gains (losses):      
Net realized investment gains (losses) on disposals 26,715 (18,975) 11,204
Net unrealized losses on equity securities (8,649) (29,369) 0
Other-than-temporary impairments (3,644) (6,579) (4,809)
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income 0 0 (36)
Total net realized and unrealized gains (losses) 14,422 (54,923) 6,359
Other income 12,355 9,438 10,716
Total revenues 2,846,491 2,586,080 2,469,984
Expenses:      
Loss and loss expense incurred 1,551,491 1,498,134 1,345,074
Amortization of deferred policy acquisition costs 535,973 495,042 469,236
Other insurance expenses 358,069 331,318 333,097
Interest expense 33,668 24,419 24,354
Corporate expenses 30,900 25,446 36,255
Total expenses 2,510,101 2,374,359 2,208,016
Income before federal income tax 336,390 211,721 261,968
Federal income tax expense:      
Current 60,640 35,012 62,184
Deferred 4,127 (2,230) 30,958
Total federal income tax expense 64,767 32,782 93,142
Net income $ 271,623 $ 178,939 $ 168,826
Earnings per share:      
Basic net income $ 4.57 $ 3.04 $ 2.89
Diluted net income $ 4.53 $ 3.00 $ 2.84