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DEBT - REVOLVING CREDIT FACILITY (Details) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 22, 2020 USD ($) | Apr. 27, 2020 USD ($) | Mar. 31, 2020 item | Sep. 14, 2016 USD ($) | Dec. 31, 2020 USD ($) item
Debt |  |  |  |  |
Payment of debt financing costs |  |  |  |  | $ 18,500,000
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
Uncommitted option to increase credit facility |  |  |  |  | 250,000,000
Funds available under the revolving credit facility |  |  |  |  | $ 570,100,000
Interest rate during period (as a percent) |  |  |  |  | 2.50%
Covenant threshold for debt incurred |  |  |  |  | $ 331,000,000
Revolving Credit Facility | Minimum |  |  |  |  |
Debt |  |  |  |  |
Credit facility commitment fee percentage |  |  | 0.25% |  |
Ratio of consolidated EBITDA to interest expense |  |  |  |  | 3.50
Revolving Credit Facility | Maximum |  |  |  |  |
Debt |  |  |  |  |
Credit facility commitment fee percentage |  |  | 0.55% |  |
Standby and commercial letters of credit |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity under revolving credit facility |  |  |  |  | $ 100,000,000
Standby letters of credit |  |  |  |  | 8,100,000
Standby and commercial letters of credit | Minimum |  |  |  |  |
Debt |  |  |  |  |
Line of credit fees percentage |  |  | 1.75% |  |
Standby and commercial letters of credit | Maximum |  |  |  |  |
Debt |  |  |  |  |
Line of credit fees percentage |  |  | 3.50% |  |
Swing Line Loans |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity under revolving credit facility |  |  |  |  | 50,000,000
The Senior Unsecured Notes (The "Series D Notes") |  |  |  |  |
Debt |  |  |  |  |
Debt issued |  |  |  | $ 200,000,000.0 |
Interest rate (as a percent) |  |  |  | 3.14% |
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 |
Private Loan Facilities |  |  |  |  |
Debt |  |  |  |  |
Number of consecutive quarters | item |  |  | 2 |  |
Additional interest rate based on the entity's consolidated leverage ratio |  |  | 25.00% |  |
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Minimum |  |  |  |  |
Debt |  |  |  |  |
Variable rate margin |  |  | 1.75% |  |
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Maximum |  |  |  |  |
Debt |  |  |  |  |
Variable rate margin |  |  | 3.50% |  |
Base rate | Revolving Credit Facility | Minimum |  |  |  |  |
Debt |  |  |  |  |
Variable rate margin |  |  | 0.75% |  |
Base rate | Revolving Credit Facility | Maximum |  |  |  |  |
Debt |  |  |  |  |
Variable rate margin |  |  | 2.50% |  |
MatNav | Title XI Notes |  |  |  |  |
Debt |  |  |  |  |
Minimum working capital covenant |  |  |  |  | $ 1
Debt instrument covenant ratio, maintenance of net worth |  |  |  |  | 90.00%
Payment of debt financing costs | $ 6,700,000 | $ 8,700,000 |  |  |
Debt issued | $ 139,600,000 | $ 185,900,000 |  |  |
Interest rate (as a percent) | 1.35% | 1.22% |  |  |
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 Covenant threshold for debt incurred based on the aggregate principal amount of priority debt. + References No definition available. + Details
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- Definition Covenant for minimum working capital. + References No definition available. + Details
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- Definition Debt instrument covenant, long-term debt to net worth. + References No definition available. + Details
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- Definition Debt instrument covenant ratio, maintenance of net worth. + References No definition available. + Details
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- Definition Number of consecutive quarters for measuring the leverage ratio per credit agreement. + References No definition available. + Details
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- Definition Represents the actual consolidated interest coverage ration used to determine compliance with the financial covenant of the line of credit facility. + References No definition available. + Details
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- Definition Represents the option to increase the revolving credit facility. + 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 total principal payments made during the annual reporting period. + 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 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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