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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 (Loss) [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 26,246       (42) 26,288
Common stock purchased for treasury (639)   (639)      
Common stock purchased for treasury, Shares     14      
Restricted shares forfeited     9      
Exercise of stock options 5,390 4   5,386    
Exercise of stock options, Shares   396        
Excess tax benefits 6,475     6,475    
Share-based compensation (1,421) 3 (3,604) 2,180    
Share-based compensation, Shares   296 76      
Ending Balance at Mar. 31, 2014 $ 380,895 $ 496 $ (52,675) $ 146,945 $ 316 $ 285,813
Ending Balance, Shares at Mar. 31, 2014   49,582 2,944