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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash Paid For:      
Interest $ 36,402 $ 44,226 $ 43,093
Income taxes 11 12  
Non-Cash Activity:      
Accounts payable for purchase of property, plant and equipment 8,325 5,731 14,504
Right-of-use assets acquired by operating lease 189 278 25,593
Market value of common units issued under deferred compensation plans before tax withholding requirements $ 1,082 $ 3,837 $ 17,415