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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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Future cash outflow to pay for purchases of fixed assets that have occurred.

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