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DEBT - $400 Million Credit Facility (Details) $ in Thousands				3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 15, 2016 item	Nov. 14, 2016 USD ($)	Nov. 10, 2016 USD ($) item	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)
Line of Credit Facility
PIK interest								$ 5,341
Payment of PIK interest						$ 5,341	$ 0
Restricted cash, non-current				$ 315	$ 25,507	315	25,507	23,233	$ 27,426
Restricted cash, current					8,335		8,335	7,234	$ 8,242
Secured Debt | $400 Million Credit Facility
Line of Credit Facility
Maximum borrowing capacity			$ 400,000	400,000		400,000		$ 400,000
Number of prior credit facilities refinanced | item	6
Number of vessels mortgaged | item			45
Number of vessels sold | item								5
Drawdowns during the period		$ 400,000
Repayment of secured debt					$ 100	399,600	$ 200
Repayments of debt, including PIK				393,507		404,941
PIK interest				0		0		$ 5,341
Payment of PIK interest				5,341		5,341
Long-term debt including PIK interest				0		0		398,609
PIK interest (as a percent)			1.50%
Maximum total indebtedness to total capitalization			0.70
Minimum working capital required			$ 0
Repayments for the excess cash flow sweep				4,094		15,428
Restricted cash, non-current				$ 0		$ 0		$ 11,180
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%
Prepayment under cash sweep required			$ 0
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%

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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