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CONVERTIBLE SENIOR NOTES (Details) (USD $)
 0 Months Ended 3 Months Ended
Jul. 27, 2010
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Convertible senior notes        
Net carrying amount of the liability component   $ 112,097,000    
Net carrying amount of the liability component       110,918,000
Non-cash interest expense recognized   1,179,000 1,090,000  
Non-cash deferred financing amortization costs included in interest expense   1,835,000 980,000  
2010 Notes
        
Convertible senior notes        
2010 Notes issued 125,000,000      
Carrying amount of the equity component (additional paid-in capital)   24,375,000   24,375,000
Principal amount of the 2010 Notes   125,000,000   125,000,000
Unamortized discount of the liability component   12,903,000   14,082,000
Net carrying amount of the liability component   112,097,000    
Net carrying amount of the liability component       110,918,000
Effective interest rate on liability component (as a percent)   10.00% 10.00%  
Cash interest expense recognized   1,541,000 1,562,000  
Non-cash interest expense recognized   1,179,000 1,091,000  
Non-cash deferred financing amortization costs included in interest expense   177,000 179,000  
Remaining period over which the unamortized discount will be recognized   2 years 4 months 17 days    
Non-payment of minimum indebtedness at final maturity for default   $ 50,000,000