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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash Paid For: |  |  |
Interest | $ 36,402 | $ 44,226 | $ 43,093
Income taxes | 11 | 12 |
Non-Cash Activity: |  |  |
Accounts payable for purchase of property, plant and equipment | 8,325 | 5,731 | 14,504
Right-of-use assets acquired by operating lease | 189 | 278 | 25,593
Market value of common units issued under deferred compensation plans before tax withholding requirements | $ 1,082 | $ 3,837 | $ 17,415

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