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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Paid For: |  |  |
Interest | $ 44,226 | $ 43,093 | $ 38,450
Income taxes | 12 |  | 34
Non-Cash Activity: |  |  |
Accounts payable for purchase of property, plant and equipment | 5,731 | 14,504 | 14,585
Right-of-use assets acquired by operating lease | 278 | 25,593 |
Market value of common units issued under deferred compensation plans before tax withholding requirements | $ 3,837 | $ 17,415 | $ 6,142

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