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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2014 $ 371,813 $ 88 $ 2,261,952 $ (1,888,247) $ (1,980)
Balance, Shares at Dec. 31, 2014   87,700      
Net loss (15,661)     (15,661)  
Other comprehensive loss, net of tax (2,438)       (2,438)
Issuance of Common Stock under option, stock award and purchase plans 5,673 $ 3 5,670    
Issuance of Common Stock under option, stock award and purchase plans, Shares   2,855      
Repurchase of Common Stock (72,863) $ (15) (72,848)    
Repurchase of Common Stock, Shares   (14,540)      
Stock-based compensation 15,582   15,582    
Conversion feature of convertible notes due 2020 26,062   26,062    
Balance at Dec. 31, 2015 328,168 $ 76 2,236,418 (1,903,908) (4,418)
Balance, Shares at Dec. 31, 2015   76,015      
Net loss (72,314)     (72,314)  
Other comprehensive loss, net of tax (2,852)       (2,852)
Issuance of Common Stock under option, stock award and purchase plans 2,800 $ 2 2,798    
Issuance of Common Stock under option, stock award and purchase plans, Shares   2,441      
Stock-based compensation 13,242   13,242    
Issuance of warrant 1,597   1,597    
Balance at Dec. 31, 2016 270,641 $ 78 2,254,055 (1,976,222) (7,270)
Balance, Shares at Dec. 31, 2016   78,456      
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2016-09 [Member] 69   69 (69)  
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2016-16 [Member] 1,434     1,434  
Balance at Jan. 01, 2017 272,075 $ 78 2,254,124 (1,974,857) (7,270)
Balance, Shares at Jan. 01, 2017   78,456      
Balance at Dec. 31, 2016 270,641 $ 78 2,254,055 (1,976,222) (7,270)
Balance, Shares at Dec. 31, 2016   78,456      
Net loss (82,955)     (82,955)  
Other comprehensive loss, net of tax 10,652       10,652
Issuance of Common Stock under option, stock award and purchase plans 1,959 $ 5 1,954    
Issuance of Common Stock under option, stock award and purchase plans, Shares   4,098      
Stock-based compensation 16,612   16,612    
Balance at Dec. 31, 2017 $ 218,343 $ 83 $ 2,272,690 $ (2,057,812) $ 3,382
Balance, Shares at Dec. 31, 2017   82,554