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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues:        
Net premiums earned $ 614,277 $ 572,055 $ 1,810,941 $ 1,700,939
Net investment income earned 52,443 40,446 141,227 119,295
Net realized and unrealized (losses) gains:        
Net realized investment (losses) gains on disposals (751) 6,871 4,034 12,252
Other-than-temporary impairments (1,426) (43) (5,459) (4,729)
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income 0 (30) 0 (36)
Unrealized losses on equity securities (2,610) 0 (15,563) 0
Total net realized and unrealized (losses) gains (4,787) 6,798 (16,988) 7,487
Other income 2,538 1,994 7,896 8,526
Total revenues 664,471 621,293 1,943,076 1,836,247
Expenses:        
Loss and loss expense incurred 379,199 344,587 1,130,468 1,003,618
Amortization of deferred policy acquisition costs 124,511 118,143 368,265 350,071
Other insurance expenses 80,108 78,874 244,342 243,799
Interest expense 6,073 6,085 18,350 18,272
Corporate expenses 7,450 6,289 22,065 26,669
Total expenses 597,341 553,978 1,783,490 1,642,429
Income before federal income tax 67,130 67,315 159,586 193,818
Federal income tax expense:        
Current 10,314 16,859 23,529 48,917
Deferred 1,381 3,738 2,878 6,317
Total federal income tax expense 11,695 20,597 26,407 55,234
Net income $ 55,435 $ 46,718 $ 133,179 $ 138,584
Earnings per share:        
Basic net income $ 0.94 $ 0.80 $ 2.26 $ 2.37
Diluted net income 0.93 0.79 2.23 2.34
Dividends to stockholders $ 0.18 $ 0.16 $ 0.54 $ 0.48