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DEBT - $100M and $253M Term Loans (Details) $ in Thousands					1 Months Ended	12 Months Ended
	Mar. 29, 2016 USD ($)	Mar. 11, 2016 USD ($)	Apr. 30, 2015 USD ($)	Jul. 09, 2014 USD ($)	Jul. 31, 2015 USD ($) item	Dec. 31, 2015 USD ($) item	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2010 item	Aug. 20, 2010 USD ($)	Aug. 12, 2010 USD ($) item
Line of Credit Facility
Debt classified as current liability						$ 579,023	$ 540,455
Secured Debt | $100 Million Term Loan Facility
Line of Credit Facility
Maximum borrowing capacity							100,000	$ 100,000			$ 100,000
Prepayment of amortization payment before due date	$ 1,923
Remaining borrowing capacity							0
Long-term Debt						$ 58,899	53,375
Debt classified as current liability							53,375
Number of vessels acquired | item											5
Paydown of debt				$ 1,923
Payment of upfront fees			$ 165
Number of unencumbered vessels adding as additional collateral to cover the shortfall of fair value | item						2
Secured Debt | $253 Million Term Loan Facility
Line of Credit Facility
Maximum borrowing capacity						$ 253,000	253,000	$ 253,000		$ 253,000
Remaining borrowing capacity							0
Long-term Debt						142,740	128,033
Debt classified as current liability							128,033
Paydown of debt				5,075	$ 5,075
Payment of upfront fees			$ 350
Number of unencumbered vessels adding as additional collateral to cover the shortfall of fair value | item					5
Number of vessels delivered pursuant to the agreement | item									13
Restricted cash						$ 9,750	$ 9,750
Prepayment of the outstanding indebtedness		$ 5,075			$ 1,650
Secured Debt | $100 Million and $253 Million Term Loan Facilities
Line of Credit Facility
Minimum cash balance required per vessel owned				$ 750
Maximum total debt outstanding to value adjusted total assets ratio			70.00%
Maximum percentage of liquidity covenant amended			50.00%
Minimum cash required to be maintained by each collateralized vessel			$ 750
Minimum period of available working capital lines			6 months
Secured Debt | $100 Million and $253 Million Term Loan Facilities | LIBOR
Line of Credit Facility
Applicable margin over reference rate for interest payable, before increase (as a percent)				3.00%
Applicable margin over reference rate (as a percent)				3.50%

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- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument before amendment.

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- Definition

Represents the minimum cash required per vessel mortgaged under this facility.

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

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Represents the amount of upfront fee paid under the terms of credit facilities.

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Represents the amended maximum percentage of fleet wide liquidity covenant required.

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Represents the ratio of total debt outstanding to value adjusted total assets (total assets adjustment for the difference between book value and market value of fleet vessels).

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Represents the minimum period of working capital lines with remaining availability, in which the covenant of 50% of the required covenant of cash per vessel is satisfied.

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Number of unencumbered assets adding as additional collateral to cover the shortfall of fair value of mortgaged assets.

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Represents the number of vessels to be acquired by the entity under purchase agreement.

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Amount of cash outflow for prepayment of amortization payment before due date.

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Amount of payment made towards outstanding debt during the period.

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

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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