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DEBT - REVOLVING CREDIT FACILITY (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Sep. 14, 2016 USD ($) | Dec. 31, 2021 USD ($) item | Jun. 22, 2020 USD ($) | Apr. 27, 2020 USD ($)
Title XI Notes |  |  |  |  |
Debt |  |  |  |  |
The number of vessels committed to securing debt | item |  |  | 2 |  |
Revolving Credit Facility |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity under revolving credit facility | $ 650,000,000 |  |  |  |
Ratio of debt instrument covenant threshold leverage | 3.50 |  |  |  |
Ratio of debt instrument covenant threshold leverage connection with material acquisition | 4.0 |  |  |  |
Fees paid | $ 2,200,000 |  |  |  |
Funds available under the revolving credit facility |  |  | $ 642,000,000.0 |  |
Interest rate during period (as a percent) |  |  | 1.10% |  |
Standby commercial letters of credit |  |  |  |  |
Debt |  |  |  |  |
Used portion of revolving credit facility |  |  | $ 8,000,000.0 |  |
The Senior Unsecured Notes (The "Series D Notes") |  |  |  |  |
Debt |  |  |  |  |
Debt issued |  | $ 200,000,000.0 |  |  |
Debt instrument term |  | 15 years |  |  |
Maturities of Long-term Debt |  |  |  |  |
Semi-annual principal payments in year 2019 |  | $ 6,000,000.0 |  |  |
Semi-annual principal payments in 2020 to 2023 |  | 9,200,000 |  |  |
Semi-annual principal payments in 2024 to 2031 |  | $ 7,150,000 |  |  |
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Minimum |  |  |  |  |
Debt |  |  |  |  |
Variable rate margin | 1.00% |  |  |  |
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Maximum |  |  |  |  |
Debt |  |  |  |  |
Variable rate margin | 1.75% |  |  |  |
Base rate | Revolving Credit Facility | Minimum |  |  |  |  |
Debt |  |  |  |  |
Variable rate margin | 0.00% |  |  |  |
Base rate | Revolving Credit Facility | Maximum |  |  |  |  |
Debt |  |  |  |  |
Variable rate margin | 0.75% |  |  |  |
MatNav | Title XI Notes |  |  |  |  |
Debt |  |  |  |  |
Minimum working capital covenant |  |  | $ 1 |  |
Debt instrument covenant ratio, maintenance of net worth |  |  | 90.00% |  |
Debt issued |  |  |  | $ 139,600,000 | $ 185,900,000
Annual principal payments |  |  |  | $ 3,000,000.0 | $ 4,000,000.0
MatNav | Minimum | Title XI Notes |  |  |  |  |
Debt |  |  |  |  |
Debt instrument covenant, long-term debt to net worth |  |  | 2.00% |  |

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- Definition Debt instrument covenant ratio, maintenance of net worth. + References No definition available. + Details
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- Definition Threshold leverage ratio under the debt instrument covenant. + References No definition available. + Details
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- Definition Threshold leverage ratio in connection with material acquisition under the debt instrument covenant. + References No definition available. + Details
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- Definition Amount of semi-annual principal payments that the company has to pay after year five since the first year of maturity payment as stated in the agreement. + References No definition available. + Details
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- Definition Amount of semi-annual principal payments that the company has to pay in the year one as stated in the agreement. + References No definition available. + Details
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- Definition Amount of semi-annual principal payments that the company has to pay in year two to year five since the first year of maturity payment as stated in the agreement. + References No definition available. + Details
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- Definition The number of vessels committed to securing debt. + References No definition available. + Details
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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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