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Condensed Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Comprehensive Income
Balance at Dec. 31, 2009$ 763,784$ 493$ 146,036$ 598,493$ 18,762  
Balance (in shares) at Dec. 31, 2009 49,377     
Comprehensive income (loss):       
Net income (loss)33,085  33,085  33,085
Other comprehensive income:       
Translation adjustment, net of tax expense (benefit) of $4 and $(14) for the nine months ended September 30, 2011 and 2010, respectively and $26 for the three months ended December 31, 2010(5,039)   (5,039) (5,039)
Comprehensive income (loss)28,046     28,046
Stock options exercised9781977    
Stock options exercised (in shares) 39     
Stock compensation995 995    
Tax effect of options exercised(118) (118)    
Cash dividends declared on common stock, $0.375 and $0.30 per share for the nine months ended September 30, 2011 and 2010, respectively and $0.10 per share for the three months ended December 31, 2010(14,859)  (14,859)   
Common stock issued for stock bonus at $30.91 and $26.42 per share for the nine months ended September 30, 2011 and 2010, respectively301 301    
Common stock issued for stock bonus (in shares) 12     
Balance at Sep. 30, 2010779,127494148,191616,71913,723  
Balance (in shares) at Sep. 30, 2010 49,428     
Comprehensive income (loss):       
Net income (loss)(4,499)  (4,499)  (4,499)
Other comprehensive income:       
Translation adjustment, net of tax expense (benefit) of $4 and $(14) for the nine months ended September 30, 2011 and 2010, respectively and $26 for the three months ended December 31, 2010904   904 904
Comprehensive income (loss)(3,595)     (3,595)
Stock options exercised16,970616,964    
Stock options exercised (in shares) 668     
Stock compensation2,582 2,582    
Tax effect of options exercised(2,312) (2,312)    
Cash dividends declared on common stock, $0.375 and $0.30 per share for the nine months ended September 30, 2011 and 2010, respectively and $0.10 per share for the three months ended December 31, 2010(4,979)  (4,979)   
Balance at Dec. 31, 2010787,793500165,425607,24114,627  
Balance (in shares) at Dec. 31, 2010 50,096     
Comprehensive income (loss):       
Net income (loss)45,951  45,951  45,951
Other comprehensive income:       
Translation adjustment, net of tax expense (benefit) of $4 and $(14) for the nine months ended September 30, 2011 and 2010, respectively and $26 for the three months ended December 31, 2010(3,615)   (3,615) (3,615)
Comprehensive income (loss)42,336     42,336
Stock options exercised154 154    
Stock options exercised (in shares) 6     
Stock compensation3,405 3,405    
Tax effect of options exercised(71) (71)    
Repurchase of common stock(53,208)    (53,208) 
Repurchase of common stock (in shares) (1,948)     
Retirement of common stock (19) (53,189) 53,208 
Cash dividends declared on common stock, $0.375 and $0.30 per share for the nine months ended September 30, 2011 and 2010, respectively and $0.10 per share for the three months ended December 31, 2010(18,331)  (18,331)   
Common stock issued for stock bonus at $30.91 and $26.42 per share for the nine months ended September 30, 2011 and 2010, respectively204 204    
Common stock issued for stock bonus (in shares) 7     
Balance at Sep. 30, 2011$ 762,282$ 481$ 169,117$ 581,672$ 11,012  
Balance (in shares) at Sep. 30, 2011 48,161