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DEBT - PRIVATE PLACEMENT TERM LOANS (Details) $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Jun. 22, 2020 USD ($) | Apr. 27, 2020 USD ($) | Dec. 21, 2016 USD ($) | Sep. 14, 2016 USD ($) | Aug. 31, 2004 USD ($) | Sep. 30, 2003 USD ($) | Jun. 30, 2012 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($)
Debt |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | $ 325,500 |
Letters of credit |  |  |  |  |  |  |  |  |  | $ 8,000
5.34 %, payable through 2028 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 5.34%
5.34 %, payable through 2028 | MatNav |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 55,000 |  |  |
Semi-annual payments |  |  |  |  |  |  | $ 1,100 |  |  |
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 |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 55,000 |  |  |  |
Semi-annual payments |  |  |  |  |  | $ 1,100 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.27% |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  | $ 170,000 |  |
Number of tranches | item |  |  |  |  |  |  |  | 3 |  |
Unsecured Debt | Debt instrument redemption 2017 through mid-year 2023 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  |  |  |  |  | $ 4,600 |  |
Unsecured Debt | Debt instrument redemption mid-year 2023 through mid-year 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  |  |  |  |  | 8,400 |  |
Unsecured Debt | Debt instrument redemption after mid-year 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  |  |  |  |  | 3,800 |  |
Unsecured Debt | Debt Instrument Redemption After mid-year 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  |  |  |  |  | 1,200 |  |
Unsecured debt, tranche maturing in 2023 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  | $ 77,500 |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 3.66% |  |
Unsecured debt, tranche maturing in 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  | $ 55,000 |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 4.16% |  |
Unsecured debt, tranche maturing in 2032 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  | $ 37,500 |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 4.31% |  |
Senior Unsecured Series A Notes |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  | $ 75,000 |  |  |  |  |  |
Debt instrument term |  |  |  | 11 years |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.37% |  |  |  |  |  |
Senior Unsecured Series A Notes | Debt Instrument Redemption Period One [Member] |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  | $ 5,800 |  |  |  |  |  |
Senior Unsecured Series A Notes | Debt Instrument Redemption 2022 through 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  | $ 11,500 |  |  |  |  |  |
Title XI Notes | MatNav |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  | $ 139,600 | $ 185,900 |  |  |  |  |  |  |
Annual principal payments |  | 3,000 | 4,000 |  |  |  |  |  |  |
Payment of debt financing costs |  | $ 6,700 | $ 8,700 |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.35% | 1.22% |  |  |  |  |  |  |
The Senior Unsecured Notes (The "Series D Notes") |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | $ 200,000 |  |  |  |  |
Debt instrument term |  |  |  |  | 15 years |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 3.14% |  |  |  |  |
Maturities of Long-term Debt |  |  |  |  |  |  |  |  |  |
Semi-annual principal payments in year 2019 |  |  |  |  | $ 6,000 |  |  |  |  |
Semi-annual principal payments in 2020 to 2023 |  |  |  |  | 9,200 |  |  |  |  |
Semi-annual principal payments in 2024 to 2031 |  |  |  |  | $ 7,150 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |

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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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