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Consolidated Statement of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2013 $ 344,844 $ 489 $ (48,432) $ 132,904 $ 358 $ 259,525
Beginning Balance, Shares at Dec. 31, 2013   48,890 2,845      
Comprehensive income 49,155       (202) 49,357
Common stock purchased for treasury (1,676)   (1,676)      
Common stock purchased for treasury, Shares 38   38      
Restricted shares forfeited 0          
Restricted shares forfeited, Shares     15      
Exercise of stock options 6,634 5   6,629    
Exercise of stock options, Shares   470        
Excess tax benefits 7,201     7,201    
Share-based compensation 1,135 3 (3,662) 4,794    
Share-based compensation, Shares   306 77      
Ending Balance at Jun. 30, 2014 $ 407,293 $ 497 $ (53,770) $ 151,528 $ 156 $ 308,882
Ending Balance, Shares at Jun. 30, 2014   49,666 2,975