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Supplemental Consolidated Financial Statement Information - Disaggregated Revenues (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Number of business segments | segment 1  
Operating Revenues $ 24,695 $ 86,100
United States    
Operating Revenues 17,772 73,983
Canada    
Operating Revenues $ 6,923 $ 12,117