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DEBT - DESCRIPTION (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 27, 2020 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jul. 31, 2015 USD ($) | Jan. 31, 2014 USD ($) | Aug. 31, 2004 USD ($) | Sep. 30, 2003 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2012 USD ($) item | Dec. 31, 2019
Debt |  |  |  |  |  |  |  |  |  |
Payment of debt financing costs |  |  |  |  |  |  |  | $ 3,100 |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate during period (as a percent) |  |  |  |  |  |  |  | 3.50% |  |
Maximum borrowing capacity under revolving credit facility |  |  |  |  |  |  |  | $ 650,000 |  |
Uncommitted option to increase credit facility |  |  |  |  |  |  |  | 250,000 |  |
Unused portion of credit facility |  |  |  |  |  |  |  | 163,600 |  |
Payment of debt financing costs |  |  |  |  |  |  |  | $ 2,000 |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Ratio of consolidated EBITDA to interest expense |  |  |  |  |  |  |  | 3.50 |  |
Credit facility commitment fee percentage |  |  |  |  |  |  |  | 0.25% |  |
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin |  |  |  |  |  |  |  | 1.75% |  |
Revolving Credit Facility | Minimum | Base rate |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin |  |  |  |  |  |  |  | 0.75% |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Credit facility commitment fee percentage |  |  |  |  |  |  |  | 0.55% |  |
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin |  |  |  |  |  |  |  | 3.50% |  |
Revolving Credit Facility | Maximum | Base rate |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Variable rate margin |  |  |  |  |  |  |  | 2.50% |  |
Standby and commercial letters of credit |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under revolving credit facility |  |  |  |  |  |  |  | $ 100,000 |  |
Unused portion of credit facility |  |  |  |  |  |  |  | $ 7,700 |  |
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 |  |
5.34%, payable through 2028 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 5.34% |  | 5.34%
5.34%, payable through 2028 | MatNav |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 55,000 |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.34% |  |  |
Semi-annual payments |  |  |  |  |  |  | $ 1,100 |  |  |
5.79%, payable through 2020 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 5.79% |  | 5.79%
Annual principal payments |  |  |  |  |  |  |  | $ 3,500 |  |
5.27%, payable through 2029 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 5.27% |  | 5.27%
5.27%, payable through 2029 | MatNav |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 55,000 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 5.27% |  |  |  |
Semi-annual payments |  |  |  |  |  | $ 1,100 |  |  |  |
Senior Unsecured Long Term Debt |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | $ 100,000 |  |  |  |  |
Debt instrument term |  |  |  |  | 30 years |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 4.35% |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2021 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  |  | $ 5,000 |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2022 and 2023 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  |  | 7,500 |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2024 to 2027 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  |  | 10,000 |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2028 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  |  | 8,000 |  |  |  |  |
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2029 and thereafter until 2044 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  |  | $ 2,000 |  |  |  |  |
4.35%, payable through 2044 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 4.35% |  | 4.35%
Unsecured debt |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  | $ 170,000 |
Number of tranches | item |  |  |  |  |  |  |  |  | 3 |
Unsecured debt | Debt Instrument Redemption 2015 through 2016 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  |  |  |  |  |  | $ 4,600 |
Unsecured debt | Debt Instrument Redemption 2017 through mid-year 2023 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Semi-annual payments |  |  |  |  |  |  |  |  | 8,400 |
Unsecured debt | Debt Instrument Redemption Mid-year 2023 through 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% |
Notes 30 years |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  | $ 75,000 |  |  |  |  |  |
Debt instrument term |  |  |  | 30 years |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.92% |  |  |  |  |  |
Notes 30 years | Debt Instrument Redemption After 2026 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  | $ 1,500 |  |  |  |  |  |
Notes 30 years | Debt Instrument Redemption 2017 through 2019 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  | 1,800 |  |  |  |  |  |
Notes 30 years | Minimum | Debt Instrument Redemption 2020 through 2026 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  | 1,300 |  |  |  |  |  |
Notes 30 years | Maximum | Debt Instrument Redemption 2020 through 2026 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Annual principal payments |  |  |  | $ 8,000 |  |  |  |  |  |
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 2021 |  |  |  |  |  |  |  |  |  |
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 | $ 185,900 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 1.22% |  |  |  |  |  |  |  |  |
Annual principal payments | $ 4,000 |  |  |  |  |  |  |  |  |
Payment of debt financing costs | 8,700 |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 177,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |

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