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CONVERTIBLE SENIOR NOTES (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended
Jul. 27, 2010
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Convertible senior notes            
Net carrying amount of the liability component   $ 113,306,000   $ 113,306,000    
Net carrying amount of the liability component           110,918,000
Non-cash interest expense recognized       2,388,000 2,188,000  
Non-cash deferred financing amortization costs included in interest expense   1,856,000 979,000 3,691,000 1,959,000  
5.00% convertible senior notes
            
Convertible senior notes            
Interest rate on convertible senior notes (as a percent)   5.00%   5.00%    
Notes issued 125,000,000          
Carrying amount of the equity component (additional paid-in capital)   24,375,000   24,375,000   24,375,000
Principal amount of the 2010 Notes   125,000,000   125,000,000   125,000,000
Unamortized discount of the liability component   11,694,000   11,694,000   14,082,000
Net carrying amount of the liability component   113,306,000   113,306,000    
Net carrying amount of the liability component           110,918,000
Effective interest rate on liability component (as a percent)   10.00% 10.00% 10.00% 10.00%  
Cash interest expense recognized   1,571,000 1,554,000 3,112,000 3,116,000  
Non-cash interest expense recognized   1,209,000 1,097,000 2,388,000 2,188,000  
Non-cash deferred financing amortization costs included in interest expense   179,000 179,000 356,000 359,000  
Remaining period over which the unamortized discount will be recognized       2 years 1 month 17 days    
Non-payment of minimum indebtedness at final maturity for default   $ 50,000,000   $ 50,000,000