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DEBT - $400 Million Credit Facility (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 14, 2016
USD ($)
Nov. 10, 2016
USD ($)
item
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
item
Line of Credit Facility [Line Items]              
PIK interest     $ 3,828   $ 3,828   $ 800
Restricted cash, noncurrent     25,507   25,507   27,426
Repayment of the outstanding debt              
Principal, including PIK interest     525,824   525,824   524,377
Secured Debt | $400 Million Credit Facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   $ 400,000 400,000   400,000   $ 400,000
Proceeds from issuance of secured debt $ 400,000            
Number of vessels mortgaged | item   45          
Number of remaining vessels to be sold | item             5
Remaining borrowing capacity     0   0    
Repayments of Secured Debt     100 $ 0 200 $ 0  
Principal including PIK interest     396,472   396,472   $ 392,833
PIK interest (as a percent)   1.50%          
PIK interest     3,828   3,828   800
Minimum working capital required   $ 0          
Maximum total indebtedness to total capitalization   0.70%          
Restricted cash, noncurrent     $ 11,180   $ 11,180   $ 11,180
Secured Debt | $400 Million Credit Facility | Through December 31, 2018              
Line of Credit Facility [Line Items]              
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 [Line Items]              
Amortization payments per quarter   $ 7,610          
Secured Debt | $400 Million Credit Facility | From March 31, 2021 through September 30, 2021              
Line of Credit Facility [Line Items]              
Amortization payments per quarter   18,571          
Secured Debt | $400 Million Credit Facility | Period Upon Final Maturity On November 15 2021              
Line of Credit Facility [Line Items]              
Amortization payments per quarter   $ 282,605          
Secured Debt | $400 Million Credit Facility | From June 30, 2018 to December 30, 2018              
Line of Credit Facility [Line Items]              
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 [Line Items]              
Collateral security maintenance test (as a percent)   115.00%          
Prepayment under cash sweep required   $ 0          
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 [Line Items]              
Collateral security maintenance test (as a percent)   135.00%          
Secured Debt | $400 Million Credit Facility | After December 31, 2020              
Line of Credit Facility [Line Items]              
Vessel age repayment period   15 years          
Cash flow sweep option one (as a percent)   50.00%          
Secured Debt | $400 Million Credit Facility | From January 1, 2019 To December 31, 2019              
Line of Credit Facility [Line Items]              
Minimum cash balance required per vessel owned   $ 400          
Secured Debt | $400 Million Credit Facility | After January 1, 2020              
Line of Credit Facility [Line Items]              
Minimum cash balance required per vessel owned   $ 700          
Secured Debt | $400 Million Credit Facility | LIBOR              
Line of Credit Facility [Line Items]              
Reference rate   three-month LIBOR          
Applicable margin over reference rate (as a percent)   3.75%