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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues:    
Net premiums earned $ 591,828 $ 560,854
Net investment income earned 43,231 37,419
Net realized and unrealized losses:    
Net realized investment gains on disposals 4,731 2,430
Other-than-temporary impairments (1,212) (3,475)
Unrealized losses on equity securities (14,068) [1] 0
Total net realized and unrealized losses (10,549) (1,045)
Other income 2,179 3,241
Total revenues 626,689 600,469
Expenses:    
Loss and loss expense incurred 384,941 317,472
Amortization of deferred policy acquisition costs 121,093 115,350
Other insurance expenses 83,240 82,051
Interest expense 6,152 6,106
Corporate expenses 11,332 11,916
Total expenses 606,758 532,895
Income before federal income tax 19,931 67,574
Federal income tax expense:    
Current 433 14,273
Deferred 573 2,861
Total federal income tax expense 1,006 17,134
Net income $ 18,925 $ 50,440
Earnings per share:    
Basic net income $ 0.32 $ 0.87
Diluted net income 0.32 0.85
Dividends to stockholders $ 0.18 $ 0.16
[1] Unrealized holding losses in First Quarter 2018 on equity securities held as of March 31, 2018 was $5.1 million.