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CONVERTIBLE SENIOR NOTES (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Jul. 27, 2010
Debt Instrument [Line Items]            
Non-cash interest expense recognized     $ 3,653,000 $ 3,345,000    
Non-cash deferred financing amortization costs included in interest expense 3,171,000 1,596,000 6,862,000 3,555,000    
5.00% Convertible Senior Notes [Member]
            
Debt Instrument [Line Items]            
Interest rate on convertible notes (in hundredths) 5.00%   5.00%     5.00%
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   125,000,000 125,000,000
Unamortized discount of the liability component 10,429,000   10,429,000   14,082,000  
Net carrying amount of the liability component 114,571,000   114,571,000   110,918,000  
Effective interest rate on liability component (in hundredths) 10.00% 10.00% 10.00% 10.00%    
Cash interest expense recognized 1,575,000 1,580,000 4,687,000 4,696,000    
Non-cash interest expense recognized 1,265,000 1,158,000 3,653,000 3,345,000    
Non-cash deferred financing amortization costs included in interest expense 181,000 181,000 537,000 540,000    
Remaining period over which the unamortized discount will be recognized     1 year 10 months 13 days      
Non-payment of minimum indebtedness at final maturity for default $ 50,000,000   $ 50,000,000