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Consolidated Statements Of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues:        
Net premiums earned $ 833,959 $ 797,666 $ 1,642,043 $ 1,587,436
Net investment income 34,786 31,901 66,296 63,070
Net realized investment gains (losses) 14,290 21,156 (44,445) 45,616
Other 2,356 2,124 4,681 4,229
Total revenues 885,391 852,847 1,668,575 1,700,351
Expenses:        
Losses and loss adjustment expenses 605,547 588,595 1,237,781 1,195,260
Policy acquisition costs 141,520 137,839 282,504 280,438
Other operating expenses 60,822 53,432 126,221 118,620
Interest 4,256 4,229 8,522 6,682
Total expenses 812,145 784,095 1,655,028 1,601,000
Income before income taxes 73,246 68,752 13,547 99,351
Income tax expense (benefit) 13,066 17,119 (4,026) 20,738
Net income $ 60,180 $ 51,633 $ 17,573 $ 78,613
Net income per share:        
Basic (in dollars per share) $ 1.09 $ 0.93 $ 0.32 $ 1.42
Diluted (in dollars per share) $ 1.09 $ 0.93 $ 0.32 $ 1.42
Weighted average shares outstanding:        
Basic (in shares) 55,332 55,311 55,332 55,304
Diluted (in shares) 55,335 55,323 55,335 55,318
Dividends paid per share (in dollars per share) $ 0.6250 $ 0.6225 $ 1.2500 $ 1.245