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Revenue Recognition Disegragation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 179,600 |  | $ 160,200 |  | $ 671,100 |  | $ 572,200 |
Revenue from Contract with Customer, Excluding Assessed Tax | 179,600 | [1] | 160,200 | [1] | 671,100 | [2] | 572,200 | [2]
Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 146,400 |  | 130,600 |  | 497,800 |  | 429,700 |
Revenue from Contract with Customer, Excluding Assessed Tax | 146,400 | [1] | 130,600 | [1] | 497,800 | [2] | 429,700 | [2]
Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 40,700 |  | 35,600 |  | 195,300 |  | 160,100 |
Revenue from Contract with Customer, Excluding Assessed Tax | 40,700 | [1] | 35,600 | [1] | 195,300 | [2] | 160,100 | [2]
Other [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (7,500) | [1] | (6,000) | [1] | (22,000) | [2] | (17,600) | [2]
Other [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 100 |  | 200 |  | 600 |  | 900 |
Other [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 100 |  | 100 |  | 300 |  | 300 |
Energy Distribution [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 133,300 |  | 118,000 |  | 457,500 |  | 391,800 |
Energy Distribution [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 133,300 |  | 118,000 |  | 457,500 |  | 391,800 |
Energy Distribution [Member] | Delaware natural gas division [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 10,900 |  | 9,500 |  | 68,700 |  | 54,800 |
Energy Distribution [Member] | FPU Electric Distribution [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 30,700 |  | 29,900 |  | 80,100 |  | 72,400 |
Energy Distribution [Member] | Florida Public Utilities Company [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 42,300 |  | 36,900 |  | 140,200 |  | 124,800 |
Energy Distribution [Member] | Maryland Natural Gas [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 8,600 | [3] | 8,300 | [3] | 44,600 | [4] | 38,000 | [4]
Energy Distribution [Member] | Florida City Gas | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 40,800 |  | 33,400 |  | 123,900 |  | 101,800 |
Energy Transmission [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 41,700 |  | 33,500 |  | 135,700 |  | 110,300 |
Energy Transmission [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 35,700 |  | 28,900 |  | 102,100 |  | 86,800 |
Energy Transmission [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 6,000 |  | 4,600 |  | 33,600 |  | 23,500 |
Energy Transmission [Member] | Aspire [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 6,000 |  | 4,600 |  | 33,600 |  | 23,500 |
Energy Transmission [Member] | Eastern Shore Gas Company [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 20,700 |  | 19,600 |  | 64,600 |  | 60,700 |
Energy Transmission [Member] | Peninsula Pipeline [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 14,600 |  | 8,900 |  | 36,400 |  | 25,000 |
Energy Transmission [Member] | Aspire Energy Express | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 400 |  | 400 |  | 1,100 |  | 1,100 |
Energy Generation [Member] | Eight Flags [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 4,900 |  | 4,300 |  | 14,200 |  | 13,300 |
Propane Delivery [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 22,200 |  | 22,900 |  | 123,400 |  | 112,500 |
Energy Services [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 7,700 |  | 3,900 |  | 24,300 |  | 11,000 |
Energy Services [Member] | Marlin Gas Services [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 6,700 |  | 3,800 |  | 21,200 |  | 10,900 |
Energy Services [Member] | Marlin Gas Services [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  | 3,800 |  |  |  | 10,900 |
Energy Services [Member] | Other RNG | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,000 |  | 100 |  | 3,100 |  | 100 |
Eliminations [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (30,200) |  | (22,400) |  | (84,000) |  | (66,700) |
Eliminations [Member] | Regulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (22,600) |  | (16,300) |  | (61,800) |  | (48,900) |
Eliminations [Member] | Unregulated Energy [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (100) |  | (100) |  | (200) |  | (200) |
Eliminations [Member] | Eliminations [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ (7,500) |  | $ (6,000) |  | $ (22,000) |  | $ (17,600) |
[1] | (2) Total operating revenues for the three months ended September 30, 2025 include other revenue (revenues from sources other than contracts with customers) of $0.1 million and $0.1 million for our Regulated Energy and Unregulated Energy segments, respectively, and $0.2 million and $0.1 million for our Regulated Energy and Unregulated Energy segments for the three months ended September 30, 2024. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for the Maryland natural gas operations and late fees
[2] | 2) Total operating revenues for the nine months ended September 30, 2025 include other revenue (revenues from sources other than contracts with customers) of $0.6 million and $0.3 million for our Regulated Energy and Unregulated Energy segments, respectively, and $0.9 million and $0.3 million for our Regulated Energy and Unregulated Energy segments, respectively, for the nine months ended September 30, 2024. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for the Maryland natural gas operations and late fees.
[3] | (1) In accordance with the Maryland PSC approval of our natural gas base rate proceeding, effective April 2025, our natural gas distribution businesses in Maryland (Maryland natural gas division, Sandpiper Energy and Elkton Gas) are now consolidated for rate-making and other purposes and are reflected on a consolidated basis for all periods presented consistent with the final rate order. See Note 5, Rates and Other Regulatory Activities, for additional information.
[4] | (1) In accordance with the Maryland PSC approval of our natural gas base rate proceeding, effective April 2025, our natural gas distribution businesses in Maryland (Maryland natural gas division, Sandpiper Energy and Elkton Gas) are now consolidated for rate-making and other purposes and are reflected on a consolidated basis for all periods presented consistent with the final rate order. See Note 5, Rates and Other Regulatory Activities, for additional information.

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