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Consolidated Statements of Stockholders' Equity (Unaudited) - 6 months ended Jun. 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 71,102       (189) 71,291
Common stock purchased for treasury (14,585)   $ (14,585)      
Common stock purchased for treasury, shares   3,471 396      
Restricted shares forfeited 0 $ 0 $ 0 0 0 0
Restricted shares forfeited, Shares     2      
Share-based compensation 1,189 $ 3 $ (4,642) 5,828    
Share-based compensation, Shares   274 113      
Exercise of stock options $ 6,972 $ 5   6,967    
Exercise of stock options, Shares 493 493        
Excess tax benefits $ 5,354     5,354    
Ending Balance at Jun. 30, 2016 $ 680,283 $ 511 $ (88,559) $ 195,316 $ (678) $ 573,693
Ending Balance, Shares at Jun. 30, 2016   51,055 3,922