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DEBT - $98M Credit Facility (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Nov. 10, 2015
USD ($)
Nov. 04, 2015
USD ($)
subsidiary
item
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 15, 2016
USD ($)
Line of Credit Facility                  
Restricted cash, current       $ 8,335   $ 8,335 $ 7,234 $ 8,242  
Restricted cash, non-current     $ 315 25,507 $ 315 25,507 23,233 $ 27,426  
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    
Drawdowns during the period $ 98,271                
Repayment of line of credit facility     91,397 $ 0 93,939 $ 0      
Long-term debt     0   0   92,569    
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     0   0   7,234    
Restricted cash, non-current     $ 0   $ 0   $ 11,738    
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