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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION - Disaggregated Revenues (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
segment
Jun. 30, 2020
USD ($)
Number of business segments | segment     1  
Operating Revenues $ 193 $ 29,499 $ 11,941 $ 68,478
United States        
Operating Revenues $ 193 29,482 8,977 56,670
Canada        
Operating Revenues   $ 17 $ 2,964 $ 11,808