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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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