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LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Thousands | May 11, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2011
--- | --- | --- | --- | ---
Long-term debt |  |  |  |
Operating lease, liability |  | $ 15,403 | $ 15,625 |
Cal Water |  |  |  |
Long-term debt |  |  |  |
Operating lease term |  |  |  | 15 years
Operating lease, liability |  | $ 3,900 | $ 4,600 |
Secured Debt |  |  |  |
Long-term debt |  |  |  |
Debt issued | $ 280,000 |  |  |
Secured Debt | Series ZZZ Mortgage Bonds |  |  |  |
Long-term debt |  |  |  |
Debt issued | $ 130,000 |  |  |
Interest rate margin (as a percent) | 2.87% |  |  |
Secured Debt | Series 1 Mortgage Bonds |  |  |  |
Long-term debt |  |  |  |
Debt issued | $ 150,000 |  |  |
Interest rate margin (as a percent) | 3.02% |  |  |

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