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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME (USD $)
In Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Treasury Stock
Comprehensive Income
Balance at Dec. 31, 2009$ 326,398$ 362$ 248,937$ (1,815)$ 79,772$ (858) 
Balance (in shares) at Dec. 31, 2009 36,238   (56) 
Comprehensive income:       
Net income10,788   10,788 10,788
Foreign currency translation adjustment147  147  147
Total comprehensive income10,935  14710,788 10,935
Tax benefit (deficiency) from share-based compensation(335) (335)    
Common stock issued under share-based compensation plans1,0215(259)  1,275 
Common stock issued under share-based compensation plans (in shares) 497   89 
Common stock repurchased under share-based compensation plans(948)    (948) 
Common stock repurchased under share-based compensation plans (in shares)     (76) 
Share repurchases (Note 9)(29,924)    (29,924) 
Share repurchases (Note 9) (in shares)     (2,329) 
Dividends declared (Note 9)(2,632)   (2,632)  
Conversion of convertible notes27,1682427,144    
Conversion of convertible notes (in shares) 2,328     
Share-based compensation5,992 5,992    
Balance at Sep. 30, 2010337,675391281,479(1,668)87,928(30,455) 
Balance (in shares) at Sep. 30, 2010 39,063   (2,372) 
Balance at Dec. 31, 2010328,523391281,119(1,971)91,069(42,085) 
Balance (in shares) at Dec. 31, 2010 39,063   (3,295) 
Comprehensive income:       
Net income10,141   10,141 10,141
Foreign currency translation adjustment88  88  88
Total comprehensive income10,229  8810,141 10,229
Tax benefit (deficiency) from share-based compensation312 312    
Common stock issued under share-based compensation plans2,4254(1,664)  4,085 
Common stock issued under share-based compensation plans (in shares) 431   319 
Common stock repurchased under share-based compensation plans(900)    (900) 
Common stock repurchased under share-based compensation plans (in shares)     (66) 
Share repurchases (Note 9)(9,958)    (9,958) 
Share repurchases (Note 9) (in shares)     (745) 
Dividends declared (Note 9)(5,513)   (5,513)  
Share-based compensation5,589 5,589    
Balance at Sep. 30, 2011$ 330,707$ 395$ 285,356$ (1,883)$ 95,697$ (48,858) 
Balance (in shares) at Sep. 30, 2011 39,494   (3,787)