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Consolidated Statements of Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 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 43,466       (199) 43,665
Common stock purchased for treasury (14,585)   $ (14,585)      
Common stock purchased for treasury, shares   3,471 396      
Share-based compensation (1,692)   $ (4,590) 2,898    
Share-based compensation, Shares     112      
Exercise of stock options $ 3,459 $ 2   3,457    
Exercise of stock options, Shares 245 245        
Excess tax benefits $ 3,306     3,306    
Ending Balance at Mar. 31, 2016 $ 644,205 $ 505 $ (88,507) $ 186,828 $ (688) $ 546,067
Ending Balance, Shares at Mar. 31, 2016   50,533 3,919