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Consolidated Statements of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2015 $ 610,251 $ 503 $ (69,332) $ 177,167 $ (489) $ 502,402
Beginning Balance, Shares at Dec. 31, 2015   50,288 3,411      
Comprehensive income 100,201       (334) 100,535
Common stock purchased for treasury $ (15,367)   $ (15,367)      
Common stock purchased for treasury, shares 416 3,491 416      
Restricted shares forfeited $ 0 $ 0 $ 0 0 0 0
Restricted shares forfeited, Shares     7      
Share-based compensation 4,392 $ 3 $ (4,642) 9,031    
Share-based compensation, Shares   275 113      
Exercise of stock options $ 10,016 $ 7   10,009    
Exercise of stock options, Shares 712 712        
Excess tax benefits $ 7,296     7,296    
Ending Balance at Sep. 30, 2016 $ 716,789 $ 513 $ (89,341) $ 203,503 $ (823) $ 602,937
Ending Balance, Shares at Sep. 30, 2016   51,275 3,947