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DEBT - REVOLVING CREDIT FACILITY (Details) |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 27, 2023 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Aug. 31, 2004 USD ($) | Sep. 30, 2003 USD ($) | Dec. 31, 2022 USD ($) item | Jun. 22, 2020 USD ($) | Apr. 27, 2020 USD ($) | Dec. 31, 2012 USD ($) item
Debt |  |  |  |  |  |  |  |  |  |
Letters of credit |  |  |  |  |  |  | $ 7,900,000 |  |  |
MatNav |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments | $ 14,300,000 |  |  |  |  |  |  |  |  |
Extinguishment of debt | $ 12,100,000 |  |  |  |  |  |  |  |  |
Standby commercial letters of credit |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Used portion of revolving credit facility |  |  |  |  |  |  | 7,900,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 642,100,000 |  |  |
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin |  | 1.00% |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | Base rate |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin |  | 0.00% |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin |  | 1.75% |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | Base rate |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin |  | 0.75% |  |  |  |  |  |  |  |
5.34 %, payable through 2028 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.34% |  |  |
5.34 %, payable through 2028 | MatNav |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | $ 55,000,000.0 | $ 55,000,000.0 |  |  |  |
Semi-annual payments |  |  |  |  |  | $ 1,100,000 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.34% |  |  |  |
5.27 %, payable through 2029 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.27% |  |  |
5.27 %, payable through 2029 | MatNav |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  |  | $ 1,100,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 5.27% |  |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  | $ 170,000,000.0
Number of tranches | item |  |  |  |  |  |  |  |  |  | 3
Unsecured debt, tranche maturing in 2023 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  | $ 77,500,000
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 3.66%
Unsecured debt, tranche maturing in 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  | $ 55,000,000.0
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.16%
Unsecured debt, tranche maturing in 2032 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  | $ 37,500,000
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.31%
Senior Unsecured Series A Notes |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 75,000,000 |  |  |  |  |  |  |
Debt instrument term |  |  | 11 years |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.37% |  |  |  |  |  |  |
Title XI Notes |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
The number of vessels committed to securing debt | item |  |  |  |  |  |  | 2 |  |  |
Title XI Notes | MatNav |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  | $ 139,600,000 | $ 185,900,000 |
Interest rate (as a percent) |  |  |  |  |  |  |  | 1.35% | 1.22% |
Debt instrument covenant ratio, maintenance of net worth |  |  |  |  |  |  | 90.00% |  |  |
Minimum working capital covenant |  |  |  |  |  |  | $ 1 |  |  |
Title XI Notes | MatNav | Minimum |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt instrument covenant, long-term debt to net worth |  |  |  |  |  |  | 2.00% |  |  |
The Senior Unsecured Notes (The "Series D Notes") |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  | $ 200,000,000.0 |  |  |  |  |  |
Debt instrument term |  |  |  | 15 years |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.14% |  |  |  |  |  |
Amendment to 2021 Private Placement Term Loan |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Ratio of debt instrument covenant threshold leverage |  | 3.50 |  |  |  |  |  |  |  |
Ratio of debt instrument covenant threshold leverage connection with material acquisition |  | 4.0 |  |  |  |  |  |  |  |
Ratio of debt instrument threshold leverage to trigger interest enhancement payments |  | 3.25 |  |  |  |  |  |  |  |
Fees paid |  | $ 800,000 |  |  |  |  |  |  |  |

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