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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues:      
Net premiums earned $ 2,436,229 $ 2,291,027 $ 2,149,572
Net investment income earned 195,336 161,882 130,754
Net realized and unrealized (losses) gains:      
Net realized investment (losses) gains on disposals (18,975) 11,204 3,562
Other-than-temporary impairments (6,579) (4,809) (8,509)
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income 0 (36) 10
Net unrealized losses on equity securities (29,369) 0 0
Total net realized and unrealized (losses) gains (54,923) 6,359 (4,937)
Other income 9,438 10,716 8,881
Total revenues 2,586,080 2,469,984 2,284,270
Expenses:      
Loss and loss expense incurred 1,498,134 1,345,074 1,234,797
Amortization of deferred policy acquisition costs 495,042 469,236 450,328
Other insurance expenses 331,318 333,097 321,395
Interest expense 24,419 24,354 22,771
Corporate expenses 25,446 36,255 35,024
Total expenses 2,374,359 2,208,016 2,064,315
Income before federal income tax 211,721 261,968 219,955
Federal income tax expense:      
Current 35,012 62,184 48,581
Deferred (2,230) 30,958 12,879
Total federal income tax expense 32,782 93,142 61,460
Net income $ 178,939 $ 168,826 $ 158,495
Earnings per share:      
Basic net income $ 3.04 $ 2.89 $ 2.74
Diluted net income $ 3.00 $ 2.84 $ 2.70