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CONVERTIBLE SENIOR NOTES (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
Jul. 27, 2010
Jul. 27, 2010
5.00% convertible senior notes [Member]
Dec. 31, 2013
5.00% convertible senior notes [Member]
Dec. 31, 2012
5.00% convertible senior notes [Member]
Dec. 31, 2011
5.00% convertible senior notes [Member]
Convertible senior notes                  
2010 Notes issued           $ 125,000      
Interest rate on convertible notes (in hundredths)           5.00% 5.00%    
Conversion rate of common stock per $1000 of principal amount of convertible notes (in shares)           51.0204      
Principal amount used for debt instrument conversion ratio           1,000      
Initial conversion price of convertible notes into common stock (in dollars per share)           $ 19.60      
Premium on sale price to calculate exchange price of notes (as a percent)           22.50%      
Offering price of common stock (in dollars per share)       $ 1.63 $ 16.00        
Number of shares to be converted into common stock (in shares)           6,377,551      
Interest rate assumed for estimating fair value of the liability component (as a percent)           10.00%      
Estimated fair value of liability component           100,625      
Estimated fair value of conversion option           24,375 24,375 24,375  
Issuance costs allocated to equity component           918      
Issuance costs allocated to liability component           3,637      
Amortization period of debt issuance costs           5 years      
Percentage of principal amount at which the note may be repurchased prior to the maturity date of note           100.00%      
Carrying amount of the equity component (additional paid-in capital)           24,375 24,375 24,375  
Principal amount of the 2010 Notes             125,000 125,000  
Unamortized discount of the liability component             9,119 14,082  
Net carrying amount of the liability component 0 110,918         115,881 110,918  
Effective interest rate on liability component (as a percent)             10.00% 10.00% 10.00%
Cash interest expense recognized             6,250 6,263 6,231
Non-cash interest expense recognized 4,963 4,537 4,072       4,963 4,537 4,072
Non-cash deferred financing amortization costs included in interest expense 9,116 5,413 3,188       720 722 720
Remaining period over which the unamortized discount will be recognized             1 year 7 months 6 days    
Line of credit facility leverage covenant, maximum ratio of financial indebtedness to total assets             $ 50,000    
Maturity date of convertible notes           Aug. 15, 2015