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Concentrations of Credit Risk (Details) - Customer Concentration Risk [Member] | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Sales Revenue, Goods, Net [Member] | Duke Energy [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Customer |  | 242020 |
Sales Revenue, Goods, Net [Member] | NJR Energy Services Company [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Customer |  |  | 295779
Accounts Receivable [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Customer | 220222 | 151383 |
Accounts Receivable [Member] | Gas Customers [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Customer | 124509 | 72664 |
Accounts Receivable [Member] | All Other [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Customer | 4233 | 6003 |
Accounts Receivable [Member] | Coal Brokers and Distributors [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Customer | 28955 | 14435 |
Accounts Receivable [Member] | Steam Coal Utilities [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Customer | 62525 | 58281 |

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- Definition Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6327-108592 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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