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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 (Loss) Income [Member]
Retained Earnings [Member]
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 gain (5,015)       (5,015)  
Unrealized loss on investments (40)       (40)  
Total comprehensive income (loss) 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 141,625 141,625        
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 180,000 180,000        
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   81,967,000        
BALANCE, shares at Dec. 31, 2011     (8,345,000)      
Net income (loss) (142,796)         (142,796)
Foreign currency translation gain 503       503  
Unrealized loss on investments (152)       (152)  
Total comprehensive income (loss) (142,445)          
Treasury stock purchased (56,431)   (56,431)      
Treasury stock purchased, shares     (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, shares             
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 207,000 207,000        
Tax effect of options exercised and 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 81,616,987        
BALANCE, shares at Dec. 31, 2012 (14,547,253)   (14,547,253)      
Net income (loss) (164,263)         (164,263)
Foreign currency translation gain 4,295       4,295  
Unrealized loss on investments (13)       (13)  
Total comprehensive income (loss) (159,981)          
Share-based compensation expense:            
Stock option plans 2,308     2,308    
Restricted stock award plans 4,339     4,339    
Employee stock purchase plan 52     52    
Common stock issued under:            
Stock option plans 4     4    
Stock option plans, shares 1,275 1,275        
Restricted stock award plans (506) (1) (506) 1    
Restricted stock award plans, shares   (131,000) (172,000)      
Employee stock purchase plan 994 4   990    
Employee stock purchase plan, shares 403,000 403,000        
Tax effect of options exercised and stock settlements (3,616)     (3,616)    
BALANCE at Dec. 31, 2013 $ 455,384 $ 819 $ (214,494) $ 600,904 $ (503) $ 68,658
BALANCE, shares at Dec. 31, 2013 81,889,907 81,889,907        
BALANCE, shares at Dec. 31, 2013 (14,719,385)   (14,719,385)