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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Apr. 03, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract]        
Cash and cash equivalents $ 58,294   $ 105,006  
Restricted cash 5,752   3,837 $ 4,127
Investment in equity securities 36,181   49,153  
Long-term receivable (Note 4) 2,221   0  
Liabilities, Fair Value Disclosure [Abstract]        
Senior secured term loan, carrying value 338,822      
Senior secured term loan        
Liabilities, Fair Value Disclosure [Abstract]        
Senior secured term loan, carrying value 338,822 $ 412,100 413,581  
Fair Value, Level 1 | Fair Value, Measurements, Recurring        
Assets, Fair Value Disclosure [Abstract]        
Cash and cash equivalents 58,294   105,006  
Restricted cash 5,752   3,837  
Investment in equity securities 36,181   49,153  
Long-term receivable (Note 4) 0   0  
Fair Value, Level 1 | Fair Value, Measurements, Recurring | Senior secured term loan        
Liabilities, Fair Value Disclosure [Abstract]        
Senior secured term loan, fair value 0   0  
Fair Value, Level 2 | Fair Value, Measurements, Recurring        
Assets, Fair Value Disclosure [Abstract]        
Cash and cash equivalents 0   0  
Restricted cash 0   0  
Investment in equity securities 0   0  
Long-term receivable (Note 4) 0   0  
Fair Value, Level 2 | Fair Value, Measurements, Recurring | Senior secured term loan        
Liabilities, Fair Value Disclosure [Abstract]        
Senior secured term loan, fair value 330,351   407,377  
Fair Value, Level 3 | Fair Value, Measurements, Recurring        
Assets, Fair Value Disclosure [Abstract]        
Cash and cash equivalents 0   0  
Restricted cash 0   0  
Investment in equity securities 0   0  
Long-term receivable (Note 4) 2,221   0  
Fair Value, Level 3 | Fair Value, Measurements, Recurring | Senior secured term loan        
Liabilities, Fair Value Disclosure [Abstract]        
Senior secured term loan, fair value $ 0   $ 0