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DEBT - Components of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Nov. 10, 2016
Nov. 04, 2015
Line of Credit Facility        
Principal amount $ 504,426 $ 519,083    
Principal, including PIK interest 509,767 524,424    
PIK interest 5,341 5,341    
Less: Unamortized debt financing costs (8,459) (9,032)    
Less: Current portion (24,308) (24,497)    
Long-term debt, net 477,000 490,895    
Secured Debt | $400 Million Credit Facility        
Line of Credit Facility        
Principal amount 388,166 399,600    
PIK interest 5,341      
Less: Unamortized debt financing costs (5,929) (6,332)    
Maximum borrowing capacity 400,000 400,000 $ 400,000  
Secured Debt | 2014 Term Loan Facilities        
Line of Credit Facility        
Principal amount 24,863 25,544    
Less: Unamortized debt financing costs (1,283) (1,330)    
Line of Credit Facility | $98 Million Credit Facility        
Line of Credit Facility        
Principal amount 91,397 93,939    
Less: Unamortized debt financing costs (1,247) (1,370)    
Maximum borrowing capacity $ 98,000 $ 98,000   $ 98,000