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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Revenues:    
Net premiums earned $ 522,458 $ 476,123
Net investment income earned 30,769 26,917
Net realized (losses) gains:    
Net realized investment gains 889 20,977
Other-than-temporary impairments (3,593) (2,094)
Total net realized (losses) gains (2,704) 18,883
Other income 951 1,969
Total revenues 551,474 523,892
Expenses:    
Loss and loss expense incurred 297,144 284,999
Policy acquisition costs 183,227 164,723
Interest expense 5,606 5,604
Other expenses 13,622 12,276
Total expenses 499,599 467,602
Income before federal income tax 51,875 56,290
Federal income tax expense:    
Current 14,084 12,254
Deferred 759 4,328
Total federal income tax expense 14,843 16,582
Net income $ 37,032 $ 39,708
Earnings per share:    
Basic net income $ 0.64 $ 0.70
Diluted net income 0.63 0.69
Dividends to stockholders $ 0.15 $ 0.14