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DEBT - $98M Credit Facility (Details)
$ in Thousands
12 Months Ended
Nov. 10, 2015
USD ($)
Nov. 04, 2015
USD ($)
subsidiary
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nov. 15, 2016
USD ($)
Jun. 29, 2016
USD ($)
Jun. 28, 2016
Line of Credit Facility                
Restricted cash, current     $ 7,234 $ 8,242 $ 19,500      
Restricted cash, non-current     23,233 27,426 315      
Repayment of the outstanding debt                
Total debt     519,083 523,577        
$98 Million Credit Facility Commitment Letter                
Line of Credit Facility                
Collateral security maintenance test (as a percent)             120.00% 140.00%
$98 Million Credit Facility Commitment Letter | Minimum                
Line of Credit Facility                
Minimum cash requirement through the end of the waiver period             $ 25,000  
Line of Credit Facility | $98 Million Credit Facility                
Line of Credit Facility                
Number of wholly owned subsidiaries | subsidiary   13            
Maximum borrowing capacity   $ 98,000 98,000 98,000 98,000 $ 98,000    
Drawdowns during the period $ 98,271       98,271      
Remaining borrowing capacity     0          
Repayment of line of credit facility     1,332 3,000 $ 0      
Long-term debt     92,569 93,403        
Fixed amortization payment for the first two years   $ 0            
Period without fixed amortization schedule   2 years            
Amount of periodic payment   $ 2,500            
Maximum collateral required for prepayment of loan (as a percent)   182.00%            
Number of collateral vessels | item   13            
Minimum cash required to be maintained by each collateralized vessel           $ 750    
Collateral security maintenance test (as a percent)           140.00%    
Restricted cash, current     7,234 8,242        
Restricted cash, non-current     11,738 15,931        
Repayment of the outstanding debt                
2018     10,000          
2019     10,000          
2020     73,939          
Total debt     $ 93,939 $ 95,271        
Line of Credit Facility | $98 Million Credit Facility | LIBOR                
Line of Credit Facility                
Reference rate   three-month LIBOR            
Applicable margin over reference rate for interest payable   6.125%            
Line of Credit Facility | $98 Million Credit Facility | Minimum                
Line of Credit Facility                
Loan repayment requirement to have the ability to pay dividends after December 31, 2018           $ 25,000