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Concentrations of Credit Risk and Major Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Concentration Risk [Line Items] |  |  |
Receivables related to contracts with customers | $ 133,480 | $ 252,424 |
NJR Energy Services Company |  |  |
Concentration Risk [Line Items] |  |  |
Revenue from contracts with customers | 147,540 | 219,472 | $ 147,595
Direct Energy Business Marketing LLC |  |  |
Concentration Risk [Line Items] |  |  |
Revenue from contracts with customers | 214,980 | 184,668 | $ 153,565
Accounts Receivable | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Receivables related to contracts with customers | 133,480 | 252,424 |
Accounts Receivable | Customer Concentration Risk | Gas Wholesalers |  |  |
Concentration Risk [Line Items] |  |  |
Receivables related to contracts with customers | 115,641 | 232,638 |
Accounts Receivable | Customer Concentration Risk | NGL, Condensate & Processing Facilities |  |  |
Concentration Risk [Line Items] |  |  |
Receivables related to contracts with customers | 10,140 | 12,595 |
Accounts Receivable | Customer Concentration Risk | Other |  |  |
Concentration Risk [Line Items] |  |  |
Receivables related to contracts with customers | 7,699 | 7,191 |
Accounts Receivable | Customer Concentration Risk | NJR Energy Services Company |  |  |
Concentration Risk [Line Items] |  |  |
Receivables related to contracts with customers | 15,401 | 30,872 |
Accounts Receivable | Customer Concentration Risk | Direct Energy Business Marketing LLC |  |  |
Concentration Risk [Line Items] |  |  |
Receivables related to contracts with customers | $ 23,859 | $ 26,417 |

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