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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
BALANCE at Dec. 31, 2009 $ 922,045 $ 954 $ (221,887) $ 662,865 $ 8,408 $ 471,705
BALANCE, shares at Dec. 31, 2009   95,399,000        
BALANCE, shares at Dec. 31, 2009     (9,614,000)      
Net income (loss) 157,773         157,773
Foreign currency translation (loss) gain (8,577)       (8,577)  
Unrealized (losses) gains on investments 88       88  
COMPREHENSIVE (LOSS) INCOME 149,284          
Treasury stock purchased (154,913)   (154,913)      
Treasury stock purchased, shares     (5,427,000)      
Treasury stock retirement   (151) 379,139 (106,654)   (272,334)
Treasury stock retirement, shares   (15,119,000) 15,119,000      
Share-based compensation expense:            
Stock option plans 7,419     7,419    
Restricted stock award plans 9,485     9,485    
Employee stock purchase plan 414     414    
Common stock issued under:            
Stock option plans 766     766    
Stock option plans, shares 51,528 52,000        
Restricted stock award plans (2,530) 8 (2,530) (8)    
Restricted stock award plans, shares   774,000 (89,000)      
Employee stock purchase plan 2,344 1   2,343    
Employee stock purchase plan, shares 100,000 114,000        
Tax benefit of options exercised 223     223    
BALANCE at Dec. 31, 2010 934,537 812 (191) 576,853 (81) 357,144
BALANCE, shares at Dec. 31, 2010   81,220,000        
BALANCE, shares at Dec. 31, 2010     (11,000)      
Net income (loss) 18,573         18,573
Foreign currency translation (loss) gain (5,015)       (5,015)  
Unrealized (losses) gains on investments (40)       (40)  
COMPREHENSIVE (LOSS) INCOME 13,518          
Treasury stock purchased (150,445)   (150,445)      
Treasury stock purchased, shares     (8,056,000)      
Share-based compensation expense:            
Stock option plans 5,453     5,453    
Restricted stock award plans 8,978     8,978    
Employee stock purchase plan 400     400    
Common stock issued under:            
Stock option plans 2,069 2   2,067    
Stock option plans, shares 141,625 142,000        
Restricted stock award plans (5,639) 4 (5,639) (4)    
Restricted stock award plans, shares   425,000 (278,000)      
Employee stock purchase plan 2,301 2   2,299    
Employee stock purchase plan, shares 200,000 180,000        
Tax effect of options exercised and stock settlements (5,081)     (5,081)    
BALANCE at Dec. 31, 2011 806,091 820 (156,275) 590,965 (5,136) 375,717
BALANCE, shares at Dec. 31, 2011 81,966,793 81,967,000        
BALANCE, shares at Dec. 31, 2011 (8,345,245)   (8,345,000)      
Net income (loss) (142,796)         (142,796)
Foreign currency translation (loss) gain 503       503  
Unrealized (losses) gains on investments (152)       (152)  
COMPREHENSIVE (LOSS) INCOME (142,445)          
Treasury stock purchased (56,431)   (56,431)      
Treasury stock purchased, shares (6,100,000)   (6,072,000)      
Share-based compensation expense:            
Stock option plans 2,907     2,907    
Restricted stock award plans 6,637     6,637    
Employee stock purchase plan 143     143    
Common stock issued under:            
Stock option plans                  
Restricted stock award plans (1,282) (6) (1,282) 6    
Restricted stock award plans, shares   (557,000) (130,000)      
Employee stock purchase plan 1,599 2   1,597    
Employee stock purchase plan, shares 200,000 207,000        
Tax effect of stock settlements (5,429)       (5,429)      
BALANCE at Dec. 31, 2012 $ 611,790 $ 816 $ (213,988) $ 596,826 $ (4,785) $ 232,921
BALANCE, shares at Dec. 31, 2012 81,616,987 81,617,000        
BALANCE, shares at Dec. 31, 2012 (14,547,253)   (14,547,000)