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SUPPLEMENTAL CASH FLOW INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2022
SUPPLEMENTAL CASH FLOW INFORMATION |
Schedule of supplemental cash flow information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2022 |  | 2021 |  | 2020 |
​ |  | ​ | (in thousands) | ​
Cash Paid For: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest | ​ | $ | 34,844 | ​ | $ | 36,402 | ​ | $ | 44,226 | ​
Income taxes | ​ | $ | 23,794 | ​ | $ | 11 | ​ | $ | 12 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-Cash Activity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts payable for purchase of property, plant and equipment | ​ | $ | 44,281 | ​ | $ | 8,325 | ​ | $ | 5,731 | ​
Right-of-use assets acquired by operating lease | ​ | $ | 1,315 | ​ | $ | 189 | ​ | $ | 278 | ​
Market value of common units issued under deferred compensation plans before tax withholding requirements | ​ | $ | — | ​ | $ | 1,082 | ​ | $ | 3,837 | ​

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