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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, 2019 USD ($)	Jun. 30, 2018 USD ($) item	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($) item	Dec. 31, 2017 item	Dec. 31, 2018 USD ($)
Line of Credit Facility
Number of vessels sold | item					0		0
Payment of PIK interest							$ 5,341
Secured Debt | $400 Million Credit Facility
Line of Credit Facility
Maximum borrowing capacity			$ 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
PIK interest				$ 0		$ 0			$ 0
PIK interest (as a percent)			1.50%
Maximum total indebtedness to total capitalization (as a ratio)			0.70
Minimum working capital required			$ 0
Repayments for the excess cash flow sweep					4,094		15,428
Repayments of debt, including PIK				$ 0	393,507	$ 0	404,941
Payment of PIK interest					$ 5,341		$ 5,341
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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Interest paid other than in cash for example by issuing additional debt securities.

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- Definition

Line of credit facility covenant cash flow sweep As percentage of excess cash from collateralized vessels.

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- Definition

Represents the aggregate fair value of the mortgaged vessels to be maintained as a percentage of aggregate outstanding principal amount as per the terms of the credit facilities' covenants.

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Amount of line of credit facility prepayment under cash sweep required for initial aggregate prepayment amount.

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Amount of line of credit facility covenant threshold initial aggregate prepayments limit for prepayment under cash sweep.

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Amount of line of credit facility future amortization payments per quarter per facility agreement. Upon payment of excess cash flow to lenders, these amortization payments shall be adjusted.

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- Definition

Represents the minimum cash balance per vessel required to be maintained for vessels owned under the credit facility.

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- Definition

Represents the maximum ratio of total debt outstanding to total capitalization.

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Minimum working capital required per terms of the credit facility.

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- Definition

Represents the number of prior credit facilities refinanced during the period.

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Represents the number of vessels mortgaged by the entity as collateral in support of agreements.

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Represents cash outflow for PIK interest.

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Amount of line of credit facility repayment for the excess cash flow sweep covenant required during the period.

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Repayments of secured debt, including paid in kind interest.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
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