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DEBT - $460 Million Credit Facility (Details) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 28, 2019 USD ($) | Feb. 13, 2019 | Jun. 05, 2018 USD ($) | May 31, 2018 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Repayment of the outstanding debt |  |  |  |  |  |  |
Total debt |  |  |  |  | $ 551,420 | $ 519,083 |
Secured Debt | $460 Million Credit Facility |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Term of facilities |  |  |  | 5 years |  |  |
Maximum borrowing capacity |  |  |  | $ 460,000 | 460,000 |  |
Proceeds from credit facility |  |  | $ 460,000 |  | 460,000 |  |
Number of oldest vessels identified for sale for which debt will be paid down | item |  |  |  | 7 |  |  |
Remaining borrowing capacity |  |  |  |  | 0 |  |
Repayment of secured debt |  |  |  |  | 15,000 | 0 | $ 0
Long-term debt |  |  |  |  | 430,577 | $ 0 |
Reference rate |  |  |  | LIBOR |  |  |
Amortization payments per quarter |  |  |  | $ 15,000 |  |  |
Repaid value of loan when certain debt terms are met |  |  |  | $ 0 |  |  |
Average age of collateral vessels for repayment of loan |  |  |  | 17 years |  |  |
Percentage limit of consolidated net income for which dividends can be paid |  |  |  | 50.00% |  |  |
Collateral vessel replacement period |  |  |  | 120 days |  |  |
Collateral vessel replacement extension period |  | 180 days |  |  |  |  |
Key covenant - Unrestricted cash and cash equivalents minimum |  |  |  | $ 30,000 |  |  |
Key covenant – Percentage of unrestricted cash to total indebtedness |  |  |  | 7.50% |  |  |
Minimum restricted cash required |  |  |  | $ 0 |  |  |
Minimum working capital required |  |  |  | $ 0 |  |  |
Maximum total indebtedness to total capitalization (as a ratio) |  |  |  | 0.70 |  |  |
Key covenant – Minimum time charters period |  |  |  | 24 months |  |  |
Repayment of the outstanding debt |  |  |  |  |  |  |
2019 |  |  |  |  | 60,000 |  |
2020 |  |  |  |  | 60,000 |  |
2021 |  |  |  |  | 60,000 |  |
2022 |  |  |  |  | 60,000 |  |
2023 |  |  |  |  | 205,000 |  |
Total debt |  |  |  |  | $ 445,000 |  |
Secured Debt | $460 Million Credit Facility | Subsequent Event |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Maximum borrowing capacity | $ 460,000 |  |  |  |  |  |
Secured Debt | $460 Million Credit Facility | Period upon final maturity on May 31, 2023 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Final payment amount |  |  |  | $ 190,000 |  |  |
Secured Debt | $460 Million Credit Facility | LIBOR | Through December 31, 2018 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Applicable margin over reference rate (as a percent) |  |  |  | 3.25% |  |  |
Secured Debt | $35,000 Scrubber Tranche | Subsequent Event |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Maximum borrowing capacity | $ 35,000 |  |  |  |  |  |
Reference rate | LIBOR |  |  |  |  |  |
Percentage limit of consolidated net income for which dividends can be paid | 50.00% |  |  |  |  |  |
Collateral vessel replacement period | 180 days |  |  |  |  |  |
Secured Debt | Minimum | $460 Million Credit Facility |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  | 135.00% |  |  |
Secured Debt | Minimum | $460 Million Credit Facility | LIBOR | Period after December 31, 2018 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Applicable margin over reference rate (as a percent) |  |  |  | 3.00% |  |  |
Secured Debt | Maximum | $460 Million Credit Facility |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  | 200.00% |  |  |
Secured Debt | Maximum | $460 Million Credit Facility | LIBOR | Period after December 31, 2018 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Applicable margin over reference rate (as a percent) |  |  |  | 3.50% |  |  |
Secured Debt | Maximum | $35,000 Scrubber Tranche | Subsequent Event |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) | 200.00% |  |  |  |  |  |

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