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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]
Accumulated Earnings [Member]
Beginning Balance at Dec. 31, 2012 $ 234,059 $ 471 $ (39,136) $ 102,133 $ (223) $ 170,814
Beginning Balance, Shares at Dec. 31, 2012   47,136 2,420      
Comprehensive income 63,017       463 62,554
Common stock purchased for treasury (8,036)   (8,036)      
Common stock purchased for treasury, Shares     333      
Restricted shares forfeited     17      
Exercise of stock options 14,816 11   14,805    
Exercise of stock options, Shares   1,070        
Excess tax benefits 3,766     3,766    
Share-based compensation 6,695 6 (973) 7,662    
Share-based compensation, Shares   586 40      
Ending Balance at Sep. 30, 2013 $ 314,317 $ 488 $ (48,145) $ 128,366 $ 240 $ 233,368
Ending Balance, Shares at Sep. 30, 2013   48,792 2,810