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DEBT - $253M and $100M Term Loans (Details) $ in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2016 USD ($) | Mar. 11, 2016 USD ($) | Jul. 29, 2015 USD ($) | Apr. 30, 2015 USD ($) | Jul. 09, 2014 USD ($) | Aug. 20, 2010 USD ($) tranche item | Aug. 12, 2010 USD ($) tranche item | Oct. 31, 2015 USD ($) item | Jul. 31, 2015 item | Apr. 30, 2015 USD ($) item | Mar. 31, 2011 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2010 USD ($) | Dec. 03, 2013 USD ($) | Aug. 30, 2013 USD ($) | Sep. 30, 2010 item
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum cash balance per vessel in the fleet |  |  |  | $ 750 |  |  |  |  |  | $ 750 |  |  |  |  |  | $ 750 | $ 750 |
Secured Debt | $253 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 253,000 |  |  |  |  |  |  | $ 253,000 | $ 253,000 |  |  |  |
Number of vessels acquired | item |  |  |  |  |  | 13 |  |  |  |  |  |  |  |  |  |  |  |
Number of drawdowns | tranche |  |  |  |  |  | 13 |  |  |  |  |  |  |  |  |  |  |  |
Number of drawdowns per vessel | tranche |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused daily average unutilized commitment (as a percent) |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels owned by each of the entity's wholly-owned ship-owning subsidiaries who act as guarantors | item |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Paydown of debt |  |  |  |  | $ 5,075 |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  |  |  |  |  | $ 253,000 |  |  |  | $ 253,000 |  |  |
Number of vessels delivered pursuant to the agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12
Number of unencumbered vessels adding as additional collateral to cover the shortfall of fair value | item |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |
Prepayment of the outstanding indebtedness |  | $ 5,075 | $ 1,650 |  |  |  |  | $ 5,075 |  |  |  |  |  |  |  |  |  |
Repayments of Secured Debt |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 145,268 | 20,300 |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |
Payment of upfront fees |  |  |  | 350 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | $253 Million Term Loan Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate for interest payable, before increase (as a percent) |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | $253 Million Term Loan Facility | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  | Three-month LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | $253 Million Term Loan Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  | Six-month LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | $100 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  | 100,000 | 100,000 |  |  |  |
Number of vessels acquired | item |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |
Number of drawdowns | tranche |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |
Number of drawdowns per vessel | tranche |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  |  | Three-month LIBOR |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused daily average unutilized commitment (as a percent) |  |  |  |  |  |  | 1.35% |  |  |  |  |  |  |  |  |  |  |
Number of vessels owned by each of the entity's wholly-owned ship-owning subsidiaries who act as guarantors | item |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Paydown of debt |  |  |  |  | 1,923 |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  | $ 20,000 |  |  |  |  |  |  |  |  |  |  |
Number of unencumbered vessels adding as additional collateral to cover the shortfall of fair value | item |  |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |  |  |  |
Repayments of Secured Debt |  |  |  |  |  |  |  |  |  |  |  | 0 | 60,099 | $ 7,692 |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |
Maturity term from the date of the first drawdown |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate (as a percent) |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |
Profile for Amortization Period |  |  |  |  |  |  | 13 years |  |  |  |  |  |  |  |  |  |  |
Payment of upfront fees |  |  |  | $ 165 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of amortization payment before due date | $ 1,923 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | $100 Million Term Loan Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  |  | One-month LIBOR |  |  |  |  |  |  |  |  |  |  |
Secured Debt | $100 Million Term Loan Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate |  |  |  |  |  |  | Six-month LIBOR |  |  |  |  |  |  |  |  |  |  |
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 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 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. + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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