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Revenue Recognition Disegragation of Revenue (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 101,419,000 |  | $ 92,626,000 |  | $ 351,160,000 |  | $ 347,630,000 |
Revenue from Contract with Customer, Excluding Assessed Tax | 101,419,000 | [1] | 92,626,000 | [1] | 351,160,000 | [2] | 347,630,000 | [2]
Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 82,762,000 | [1] | 74,580,000 | [1] | 259,235,000 | [2] | 251,601,000 | [2]
Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 22,714,000 | [1] | 22,280,000 | [1] | 104,466,000 | [2] | 108,985,000 | [2]
Other Segments And Intersegments Eliminations [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (4,057,000) |  | (4,234,000) |  | (12,541,000) |  | (12,956,000) |
Other [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (4,057,000) | [1] | (4,234,000) | [1] | (12,541,000) | [2] | (12,956,000) | [2]
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (16,427,000) |  | (14,974,000) |  | (47,382,000) |  | (50,533,000) |
Eliminations [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (12,335,000) |  | (9,487,000) |  | (34,766,000) |  | (28,200,000) |
Other [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 200,000 |  | 100,000 |  | 1,000,000.0 |  | (100,000) |
Other [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 50,000.00 |  | 100,000 |  | 200,000 |  | 300,000 |
Revenue from Contract with Customer, Excluding Assessed Tax | (35,000) |  | (1,253,000) |  | (75,000) |  | (9,377,000) |
Energy Distribution [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 70,275,000 |  | 62,052,000 |  | 221,439,000 |  | 213,860,000 |
Energy Distribution [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 70,275,000 |  | 62,052,000 |  | 221,439,000 |  | 213,860,000 |
Energy Distribution [Member] | Delaware natural gas division [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 7,243,000 |  | 6,953,000 |  | 45,568,000 |  | 42,758,000 |
Energy Distribution [Member] | Delaware natural gas division [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 7,243,000 |  | 6,953,000 |  | 45,568,000 |  | 42,758,000 |
Energy Distribution [Member] | Central Florida Gas Division [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 7,309,000 |  | 6,710,000 |  | 23,018,000 |  | 21,625,000 |
Energy Distribution [Member] | Central Florida Gas Division [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 7,309,000 |  | 6,710,000 |  | 23,018,000 |  | 21,625,000 |
Energy Distribution [Member] | FPU Electric Distribution [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 29,051,000 |  | 24,174,000 |  | 58,972,000 |  | 59,016,000 |
Energy Distribution [Member] | FPU Electric Distribution [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 29,051,000 |  | 24,174,000 |  | 58,972,000 |  | 59,016,000 |
Energy Distribution [Member] | Florida Public Utilities Company [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 19,935,000 |  | 17,908,000 |  | 64,877,000 |  | 60,357,000 |
Energy Distribution [Member] | Florida Public Utilities Company [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 19,935,000 |  | 17,908,000 |  | 64,877,000 |  | 60,357,000 |
Energy Distribution [Member] | Maryland Natural Gas [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,824,000 |  | 2,634,000 |  | 15,941,000 |  | 15,867,000 |
Energy Distribution [Member] | Maryland Natural Gas [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,824,000 |  | 2,634,000 |  | 15,941,000 |  | 15,867,000 |
Energy Distribution [Member] | Sandpiper [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 3,290,000 |  | 3,673,000 |  | 12,440,000 |  | 14,237,000 |
Energy Distribution [Member] | Sandpiper [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 3,290,000 |  | 3,673,000 |  | 12,440,000 |  | 14,237,000 |
Energy Distribution [Member] | Elkton Gas [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 623,000 |  |  |  | 623,000 |  |  |
Energy Distribution [Member] | Elkton Gas [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 623,000 |  |  |  | 623,000 |  |  |
Energy Transmission [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 28,271,000 |  | 26,262,000 |  | 90,346,000 |  | 89,080,000 |
Energy Transmission [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 24,822,000 |  | 22,015,000 |  | 72,562,000 |  | 65,941,000 |
Energy Transmission [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 3,449,000 |  | 4,247,000 |  | 17,784,000 |  | 23,139,000 |
Energy Transmission [Member] | Aspire [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 3,449,000 |  | 4,247,000 |  | 17,784,000 |  | 23,139,000 |
Energy Transmission [Member] | Aspire [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 3,449,000 |  | 4,247,000 |  | 17,784,000 |  | 23,139,000 |
Energy Transmission [Member] | Eastern Shore Gas Company [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 18,389,000 |  | 17,573,000 |  | 55,944,000 |  | 54,368,000 |
Energy Transmission [Member] | Eastern Shore Gas Company [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 18,389,000 |  | 17,573,000 |  | 55,944,000 |  | 54,368,000 |
Energy Transmission [Member] | Peninsula Pipeline [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 6,433,000 |  | 4,442,000 |  | 16,618,000 |  | 11,573,000 |
Energy Transmission [Member] | Peninsula Pipeline [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 6,433,000 |  | 4,442,000 |  | 16,618,000 |  | 11,573,000 |
Energy Generation [Member] | Eight Flags [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 3,882,000 |  | 4,027,000 |  | 11,898,000 |  | 12,405,000 |
Energy Generation [Member] | Eight Flags [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 3,882,000 |  | 4,027,000 |  | 11,898,000 |  | 12,405,000 |
Propane Delivery [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 13,710,000 |  | 14,200,000 |  | 69,593,000 |  | 78,217,000 |
Propane Delivery [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 13,710,000 |  | 14,200,000 |  | 69,593,000 |  | 78,217,000 |
Energy Services [Member] | Marlin Gas Services [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,708,000 |  |  |  | 5,266,000 |  | 4,601,000 |
Energy Services [Member] | Marlin Gas Services [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,708,000 |  | 1,059,000 |  | 5,266,000 |  | 4,601,000 |
Eliminations [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (16,558,000) |  | (15,107,000) |  | (47,778,000) |  | (50,928,000) |
Eliminations [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (12,335,000) |  | (9,487,000) |  | (34,766,000) |  | (28,200,000) |
Eliminations [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (35,000) |  | (1,253,000) |  | (75,000) |  | (9,377,000) |
Eliminations [Member] | Eliminations [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (4,188,000) |  | (4,367,000) |  | (12,937,000) |  | (13,351,000) |
Other [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 131,000 |  | 133,000 |  | 396,000 |  | 395,000 |
Other [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 |  | 0 |  | 0 |  | 0 |
Other [Member] | Other [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 131,000 |  | $ 133,000 |  | $ 396,000 |  | $ 395,000 |
[1] | (1) Total operating revenues for the three months ended September 30, 2020, include other revenue (revenues from sources other than contracts with customers) of $0.2 million and $0.05 million for our Regulated and Unregulated Energy segments, respectively, and $0.1 million and $0.1 million for our Regulated and Unregulated Energy segments, respectively, for the three months ended September 30, 2019. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for the Maryland division and Sandpiper and late fees.
[2] | (1) Total operating revenues for the nine months ended September 30, 2020, include other revenue (revenues from sources other than contracts with customers) of $1.0 million and $0.2 million for our Regulated and Unregulated Energy segments, respectively, and $(0.1) million and $0.3 million for our Regulated and Unregulated Energy segments, respectively, for the nine months ended September 30, 2019. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for the Maryland division and Sandpiper and late fees.

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