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SUPPLEMENTAL CASH FLOW INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2024
SUPPLEMENTAL CASH FLOW INFORMATION |
Schedule of supplemental cash flow information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2024 |  | 2023 |  | 2022 |
​ |  | ​ | (in thousands) | ​
Cash Paid For: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest | ​ | $ | 44,834 | ​ | $ | 37,126 | ​ | $ | 34,844 | ​
Income taxes | ​ | $ | 19,540 | ​ | $ | 13,615 | ​ | $ | 23,794 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-Cash Activity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts payable for purchase of property, plant and equipment | ​ | $ | 23,728 | ​ | $ | 14,586 | ​ | $ | 44,281 | ​
Right-of-use assets acquired by operating lease | ​ | $ | 1,080 | ​ | $ | 2,596 | ​ | $ | 1,315 | ​
Market value of common units distributed under deferred compensation plans before tax withholding requirements | ​ | $ | 34,880 | ​ | $ | 28,906 | ​ | $ | — | ​
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