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DEBT - $400 Million Credit Facility (Details)
$ in Thousands
 12 Months Ended
Nov. 14, 2016
USD ($)
Nov. 10, 2016
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Line of Credit Facility          
PIK interest     $ 5,341 $ 800  
Restricted cash, non-current     23,233 27,426 $ 315
Repayment of the outstanding debt          
Principal, including PIK interest     524,424 524,377  
Secured Debt | $400 Million Credit Facility          
Line of Credit Facility          
Maximum borrowing capacity   $ 400,000 400,000 $ 400,000  
Number of vessels mortgaged | item   45      
Number of remaining vessels to be sold | item       5  
Drawdowns during the period $ 400,000     $ 400,000  
Remaining borrowing capacity     0    
Repayments of Secured Debt     400 0 $ 0
Principal including PIK interest     398,609 392,833  
PIK interest     5,341    
PIK interest (as a percent)   1.50%      
Maximum total indebtedness to total capitalization   0.70      
Minimum working capital required   $ 0      
Prepayment under cash sweep required   0      
Excess cash flow sweep     $ 11,334    
Excess cash flow sweep period     45 days    
Restricted cash, non-current     $ 11,180 $ 11,180  
Repayment of the outstanding debt          
2018     11,734    
2019     28,908    
2020     28,908    
2021     335,391    
Principal, including PIK interest     $ 404,941    
Secured Debt | $400 Million Credit Facility | Through December 31, 2018          
Line of Credit Facility          
Amortization payments per quarter   100      
Minimum cash balance required per vessel owned   $ 250      
Cash flow sweep (as a percent)   100.00%      
Secured Debt | $400 Million Credit Facility | From March 31, 2019 through December 31, 2020          
Line of Credit Facility          
Amortization payments per quarter   $ 7,610      
Secured Debt | $400 Million Credit Facility | From March 31, 2021 through September 30, 2021          
Line of Credit Facility          
Amortization payments per quarter   18,571      
Secured Debt | $400 Million Credit Facility | Period Upon Final Maturity On November 15 2021          
Line of Credit Facility          
Amortization payments per quarter   $ 282,605      
Secured Debt | $400 Million Credit Facility | From June 30, 2018 to December 30, 2018          
Line of Credit Facility          
Collateral security maintenance test (as a percent)   105.00%      
Secured Debt | $400 Million Credit Facility | From December 31, 2018 to December 30, 2020          
Line of Credit Facility          
Collateral security maintenance test (as a percent)   115.00%      
Cash flow sweep (as a percent)   75.00%      
Threshold initial aggregate prepayments limit for prepayment under cash sweep   $ 10,000      
Secured Debt | $400 Million Credit Facility | After December 30, 2020          
Line of Credit Facility          
Collateral security maintenance test (as a percent)   135.00%      
Secured Debt | $400 Million Credit Facility | After December 31, 2020          
Line of Credit Facility          
Cash flow sweep option one (as a percent)   50.00%      
Vessel age repayment period   15 years      
Secured Debt | $400 Million Credit Facility | From January 1, 2019 To December 31, 2019          
Line of Credit Facility          
Minimum cash balance required per vessel owned   $ 400      
Secured Debt | $400 Million Credit Facility | After January 1, 2020          
Line of Credit Facility          
Minimum cash balance required per vessel owned   $ 700      
Secured Debt | $400 Million Credit Facility | LIBOR          
Line of Credit Facility          
Reference rate   three-month LIBOR      
Applicable margin over reference rate (as a percent)   3.75%