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Consolidated Statements Of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenues:    
Net premiums earned $ 789,770 $ 767,085
Net investment income 31,169 29,655
Net realized investment gains 24,460 25,057
Other 2,105 2,123
Total revenues 847,504 823,920
Expenses:    
Losses and loss adjustment expenses 606,665 594,082
Policy acquisition costs 142,599 141,560
Other operating expenses 65,188 61,294
Interest 2,453 950
Total expenses 816,905 797,886
Income before income taxes 30,599 26,034
Income tax expense 3,619 2,711
Net income $ 26,980 $ 23,323
Net income per share:    
Basic (in dollars per share) $ 0.49 $ 0.42
Diluted (in dollars per share) $ 0.49 $ 0.42
Weighted average shares outstanding:    
Basic (in shares) 55,297 55,201
Diluted (in shares) 55,312 55,208
Dividends paid per share (in dollars per share) $ 0.6225 $ 0.62