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Rates and Other Regulatory Activities Federal Tax Reform Impact for Regulated Businesses (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Regulatory Liabilities Related to the Federal Tax Reform Impact [Line Items] |  |
Regulatory Liabilities | $ 142,922 | $ 147,463
Eastern Shore Gas Company [Member] |  |
Regulatory Liabilities Related to the Federal Tax Reform Impact [Line Items] |  |
Regulatory Liabilities | 34,190 |
Delaware natural gas division [Member] |  |
Regulatory Liabilities Related to the Federal Tax Reform Impact [Line Items] |  |
Regulatory Liabilities | 13,262 |
Maryland Division [Member] |  |
Regulatory Liabilities Related to the Federal Tax Reform Impact [Line Items] |  |
Regulatory Liabilities | 4,211 |
Sandpiper [Member] |  |
Regulatory Liabilities Related to the Federal Tax Reform Impact [Line Items] |  |
Regulatory Liabilities | 3,815 |
Central Florida Gas Division [Member] |  |
Regulatory Liabilities Related to the Federal Tax Reform Impact [Line Items] |  |
Regulatory Liabilities | 8,471 |
Florida Public Utilities Company [Member] |  |
Regulatory Liabilities Related to the Federal Tax Reform Impact [Line Items] |  |
Regulatory Liabilities | 19,505 |
FPU electric division [Member] |  |
Regulatory Liabilities Related to the Federal Tax Reform Impact [Line Items] |  |
Regulatory Liabilities | $ 5,995 |

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- Definition [Line Items] for Regulatory Liabilities Related to the Federal Tax Reform Impact table contains additional information on the TCJA impact for regulated energy businesses + References No definition available. + Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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