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Concentrations of Credit Risk and Major Customers - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Concentration Risk [Line Items]    
Total Accounts Receivable Trade $ 145,929 $ 133,480
Accounts Receivable | Customer Concentration Risk    
Concentration Risk [Line Items]    
Allowance for Credit Losses 84 0
Total Accounts Receivable Trade 145,929 133,480
Accounts Receivable | Customer Concentration Risk | Gas Wholesalers    
Concentration Risk [Line Items]    
Accounts Receivable Trade Before Allowance for Credit Losses 133,253 115,641
Accounts Receivable | Customer Concentration Risk | NGL, Condensate & Processing Facilities    
Concentration Risk [Line Items]    
Accounts Receivable Trade Before Allowance for Credit Losses 7,008 10,140
Accounts Receivable | Customer Concentration Risk | Other    
Concentration Risk [Line Items]    
Accounts Receivable Trade Before Allowance for Credit Losses $ 5,752 $ 7,699