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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 78,244       (129) 78,373
Common stock purchased for treasury (1,676)   (1,676)      
Common stock purchased for treasury, Shares 38   38      
Restricted shares forfeited                  
Restricted shares forfeited, Shares     29      
Exercise of stock options 6,966 5   6,961    
Exercise of stock options, Shares   489        
Excess tax benefits 7,413     7,413    
Share-based compensation 3,699 3 (3,662) 7,358    
Share-based compensation, Shares   307 77      
Ending Balance at Sep. 30, 2014 $ 439,490 $ 497 $ (53,770) $ 154,636 $ 229 $ 337,898
Ending Balance, Shares at Sep. 30, 2014   49,686 2,989