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DEBT - $400 Million Credit Facility (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 14, 2016 USD ($) | Nov. 10, 2016 USD ($) item | Dec. 31, 2016 USD ($) | Jun. 08, 2016 USD ($) | Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
PIK interest |  |  | $ 800,000 |  |
Restricted cash non-current |  |  | 27,426,000 |  | $ 315,000
Secured Debt | $400 Million Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 400,000,000 | 400,000,000 | $ 400,000,000 |
Proceeds from Issuance of Secured Debt | $ 400,000,000 |  | 400,000,000 |  |
Number of vessels mortgaged | item |  | 45 |  |  |
Number of remaining vessels to be sold | item |  | 5 |  |  |
Number of vessels contracted to be sold |  |  | 3 |  |
Remaining borrowing capacity |  |  | 0 |  |
Total outstanding including PIK interest |  |  | 392,833,000 |  | 0
PIK interest (as a percent) |  | 1.50% |  |  |
PIK interest |  | $ 800,000 | 800,000 |  |
Prepayment under cash sweep required |  | 0 |  |  |
Restricted cash non-current |  |  | 11,180,000 |  | $ 0
Repayment of the outstanding debt |  |  |  |  |
2017 |  |  | 400,000 |  |
2018 |  |  | 400,000 |  |
2019 |  |  | 30,440,000 |  |
2020 |  |  | 30,440,000 |  |
2021 |  |  | 339,120,000 |  |
Total debt |  |  | 400,800,000 |  |
Secured Debt | $400 Million Credit Facility | Through December 31, 2018 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Amortization payments per quarter |  | 100,000 |  |  |
Minimum cash balance required per vessel owned |  | $ 250,000 |  |  |
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 [Line Items] |  |  |  |  |
Amortization payments per quarter |  | $ 7,610,000 |  |  |
Secured Debt | $400 Million Credit Facility | From March 31, 2021 through September 30, 2021 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Amortization payments per quarter |  | 18,571,000 |  |  |
Secured Debt | $400 Million Credit Facility | Period Upon Final Maturity On November 15 2021 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Amortization payments per quarter |  | $ 282,605,000 |  |  |
Secured Debt | $400 Million Credit Facility | From June 30, 2018 to December 30, 2018 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
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 [Line Items] |  |  |  |  |
Collateral security maintenance test (as a percent) |  | 115.00% |  |  |
Vessel age repayment period |  | 15 years |  |  |
Cash flow sweep (as a percent) |  | 75.00% |  |  |
Cash flow sweep option one (as a percent) |  | $ 50 |  |  |
Threshold initial aggregate prepayments limit for prepayment under cash sweep |  | $ 10,000,000 |  |  |
Secured Debt | $400 Million Credit Facility | After December 30, 2020 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Collateral security maintenance test (as a percent) |  | 135.00% |  |  |
Secured Debt | $400 Million Credit Facility | From January 1, 2019 To December 31, 2019 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Minimum cash balance required per vessel owned |  | $ 400,000 |  |  |
Secured Debt | $400 Million Credit Facility | After January 1, 2020 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Minimum cash balance required per vessel owned |  | $ 700,000 |  |  |
Secured Debt | $400 Million Credit Facility | LIBOR |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Applicable margin over reference rate (as a percent) |  | 3.75% |  |  |
Secured Debt | Minimum | $400 Million Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Minimum working capital required |  |  | $ 0 |  |
Secured Debt | Maximum | $400 Million Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum total indebtedness to total capitalization |  |  | 0.70% |  |

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