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Concentrations of Credit Risk and Major Customers - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Receivables related to contracts with customers	$ 145,929	$ 133,480
Direct Energy Business Marketing LLC
Concentration Risk [Line Items]
Revenue from contracts with customers	167,390	214,980	$ 184,668
NJR Energy Services Company
Concentration Risk [Line Items]
Revenue from contracts with customers		147,540	$ 219,472
Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Receivables related to contracts with customers	145,929	133,480
Accounts Receivable | Customer Concentration Risk | Direct Energy Business Marketing LLC
Concentration Risk [Line Items]
Receivables related to contracts with customers	$ 19,995	23,859
Accounts Receivable | Customer Concentration Risk | NJR Energy Services Company
Concentration Risk [Line Items]
Receivables related to contracts with customers		$ 15,401

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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