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SUBSEQUENT EVENTS (Details) - Subsequent Event - Secured Debt - $460,000 Senior Secured Credit Facility
$ in Thousands
Dec. 31, 2018
USD ($)
May 08, 2018
USD ($)
item
Subsequent Events    
Debt term   5 years
Face amount of term loan facility   $ 460,000
Number of credit facilities upon refinance of existing credit facilities | item   1
Number of oldest vessels identified for sale for which debt will be paid down | item   7
Repaid value of loan when certain debt terms are met   $ 0
Average age of collateral vessels for repayment of loan   17 years
Percentage limit of consolidated net income for which dividends can be paid   50.00%
Collateral vessel replacement period   120 years
Key covenant - Unrestricted cash and cash equivalents minimum   $ 30,000
Key covenant – Percentage of unrestricted cash to total indebtedness   7.50%
Key covenant – Minimum working capital balance   $ 0
Key covenant – Maximum ratio of total indebtedness to total capitalization   70.00%
Key covenant – Minimum time charters period   24 months
Forecast    
Subsequent Events    
Amortization payments per quarter $ 15,000  
LIBOR | Through December 31, 2018    
Subsequent Events    
Applicable margin over reference rate (as a percent)   3.25%
Minimum    
Subsequent Events    
Collateral security maintenance test (as a percent)   135.00%
Minimum | LIBOR | Period after December 31, 2018    
Subsequent Events    
Applicable margin over reference rate (as a percent)   3.00%
Maximum    
Subsequent Events    
Collateral security maintenance test (as a percent)   200.00%
Maximum | LIBOR | Period after December 31, 2018    
Subsequent Events    
Applicable margin over reference rate (as a percent)   3.50%