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SUPPLEMENTAL CASH FLOW INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2019
SUPPLEMENTAL CASH FLOW INFORMATION |
Schedule of supplemental cash flow information |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2019 |  | 2018 |  | 2017 |
​ |  | ​ | (in thousands) | ​
Cash Paid For: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest | ​ | $ | 43,093 | ​ | $ | 38,450 | ​ | $ | 31,692 | ​
Income taxes | ​ | $ | — | ​ | $ | 34 | ​ | $ | 210 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-Cash Activity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accounts payable for purchase of property, plant and equipment | ​ | $ | 14,504 | ​ | $ | 14,585 | ​ | $ | 15,636 | ​
Assets acquired by finance lease | ​ | $ | — | ​ | $ | 835 | ​ | $ | — | ​
Right-of-use assets acquired by operating lease | ​ | $ | 25,593 | ​ | ​ | — | ​ | ​ | — | ​
Market value of common units issued under deferred compensation plans before tax withholding requirements | ​ | $ | 17,415 | ​ | $ | 6,142 | ​ | $ | 8,149 | ​
Acquisition of businesses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of assets assumed | ​ | $ | 629,475 | ​ | $ | — | ​ | $ | — | ​
Previously held equity-method investments (1) | ​ | ​ | (307,322) | ​ | ​ | — | ​ | ​ | — | ​
Cash paid, net of cash acquired | ​ | ​ | (320,232) | ​ | ​ | — | ​ | ​ | — | ​
Fair value of liabilities assumed | ​ | $ | 1,921 | ​ | $ | — | ​ | $ | — | ​
(1) | Inclusive of gain of $177.0 million as discussed in Note 3 – Acquisitions.

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