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Consolidated Statements Of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues:      
Net premiums earned $ 3,131,773 $ 2,957,897 $ 2,796,195
Net investment income 121,871 126,299 125,723
Net realized investment (losses) gains (34,255) (83,807) 81,184
Other 8,294 8,911 8,671
Total revenues 3,227,683 3,009,300 3,011,773
Expenses:      
Losses and loss adjustment expenses 2,355,138 2,145,495 1,986,122
Policy acquisition costs 562,545 539,231 526,208
Other operating expenses 235,314 250,839 249,381
Interest 3,962 3,168 2,637
Total expenses 3,156,959 2,938,733 2,764,348
Income before income taxes 70,724 70,567 247,425
Income tax (benefit) expense (2,320) (3,912) 69,476
Net income $ 73,044 $ 74,479 $ 177,949
Net income per share:      
Basic (in dollars per share) $ 1.32 $ 1.35 $ 3.23
Diluted (in dollars per share) $ 1.32 $ 1.35 $ 3.23