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Consolidated Statements Of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues:        
Net premiums earned $ 797,666 $ 779,321 $ 1,587,436 $ 1,546,406
Net investment income 31,901 31,414 63,070 61,069
Net realized investment gains 21,156 45,381 45,616 70,438
Other 2,124 1,887 4,229 4,010
Total revenues 852,847 858,003 1,700,351 1,681,923
Expenses:        
Losses and loss adjustment expenses 588,595 595,086 1,195,260 1,189,168
Policy acquisition costs 137,839 139,922 280,438 281,482
Other operating expenses 53,432 57,700 118,620 118,994
Interest 4,229 960 6,682 1,910
Total expenses 784,095 793,668 1,601,000 1,591,554
Income before income taxes 68,752 64,335 99,351 90,369
Income tax expense 17,119 15,462 20,738 18,173
Net income $ 51,633 $ 48,873 $ 78,613 $ 72,196
Net income per share:        
Basic (in dollars per share) $ 0.93 $ 0.88 $ 1.42 $ 1.31
Diluted (in dollars per share) $ 0.93 $ 0.88 $ 1.42 $ 1.31
Weighted average shares outstanding:        
Basic (in shares) 55,311 55,254 55,304 55,227
Diluted (in shares) 55,323 55,322 55,318 55,294
Dividends paid per share (in dollars per share) $ 0.6225 $ 0.62000 $ 1.245 $ 1.24