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Revenue Recognition Disegragation of Revenue (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Revenues $ 166,272,000 $ 135,593,000 $ 412,016,000 $ 353,722,000
Revenue from Contract with Customer, Excluding Assessed Tax 166,272,000 [1] 135,593,000 [1] 412,016,000 [2] 353,722,000 [2]
Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 130,625,000 [1] 101,141,000 [1] 299,051,000 [2] 243,411,000 [2]
Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 41,419,000 [1] 40,751,000 [1] 124,522,000 [2] 123,916,000 [2]
Other Segments And Intersegments Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (5,772,000) (6,299,000) (11,557,000) (13,605,000)
Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (5,772,000) [1] (6,299,000) [1] (11,557,000) [2] (13,605,000) [2]
Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (21,755,000) (20,725,000) (44,286,000) (43,262,000)
Eliminations [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (15,920,000) (14,366,000) (32,606,000) (29,528,000)
Other [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenues   200,000 700,000 800,000
Other [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 100,000 100,000 200,000 200,000
Revenue from Contract with Customer, Excluding Assessed Tax (63,000) (60,000) (123,000) (129,000)
Energy Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 118,248,000 87,913,000 273,733,000 217,400,000
Energy Distribution [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 118,248,000 87,913,000 273,733,000 217,400,000
Energy Distribution [Member] | Delaware natural gas division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 13,404,000 14,109,000 45,321,000 51,016,000
Energy Distribution [Member] | Delaware natural gas division [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 13,404,000 14,109,000 45,321,000 51,016,000
Energy Distribution [Member] | FPU Electric Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 22,546,000 23,034,000 42,510,000 45,771,000
Energy Distribution [Member] | FPU Electric Distribution [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 22,546,000 23,034,000 42,510,000 45,771,000
Energy Distribution [Member] | Florida Public Utilities Company [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 39,917,000 40,766,000 87,873,000 87,124,000
Energy Distribution [Member] | Florida Public Utilities Company [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 39,917,000 40,766,000 87,873,000 87,124,000
Energy Distribution [Member] | Maryland Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 4,681,000 4,622,000 14,536,000 16,884,000
Energy Distribution [Member] | Maryland Natural Gas [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 4,681,000 4,622,000 14,536,000 16,884,000
Energy Distribution [Member] | Sandpiper [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,898,000 4,079,000 10,955,000 11,161,000
Energy Distribution [Member] | Sandpiper [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,898,000 4,079,000 10,955,000 11,161,000
Energy Distribution [Member] | Elkton Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,308,000   4,167,000  
Energy Distribution [Member] | Elkton Gas [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,308,000 1,303,000 4,167,000 5,444,000
Energy Distribution [Member] | Florida City Gas | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 32,494,000 0 68,371,000 0
Energy Transmission [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 33,628,000 33,320,000 76,863,000 75,219,000
Energy Transmission [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 28,297,000 27,594,000 57,924,000 55,539,000
Energy Transmission [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 5,331,000 5,726,000 18,939,000 19,680,000
Energy Transmission [Member] | Aspire [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 5,331,000 5,726,000 18,939,000 19,680,000
Energy Transmission [Member] | Aspire [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 5,331,000 5,726,000 18,939,000 19,680,000
Energy Transmission [Member] | Eastern Shore Gas Company [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 19,860,000 19,632,000 41,126,000 40,302,000
Energy Transmission [Member] | Eastern Shore Gas Company [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 19,860,000 19,632,000 41,126,000 40,302,000
Energy Transmission [Member] | Peninsula Pipeline [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 8,069,000 7,593,000 16,061,000 14,504,000
Energy Transmission [Member] | Peninsula Pipeline [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 8,069,000 7,593,000 16,061,000 14,504,000
Energy Transmission [Member] | Aspire Energy Express | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 368,000 369,000 737,000 733,000
Energy Generation [Member] | Eight Flags [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 4,464,000 4,532,000 9,019,000 9,832,000
Energy Generation [Member] | Eight Flags [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 4,464,000 4,532,000 9,019,000 9,832,000
Propane Delivery [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 28,040,000 27,315,000 89,612,000 87,295,000
Propane Delivery [Member] | Florida Propane | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 28,040,000 27,315,000 89,612,000 87,295,000
Energy Services [Member] | Marlin Gas Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,647,000   7,075,000  
Energy Services [Member] | Marlin Gas Services [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,647,000 3,238,000 7,075,000 7,238,000
Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (21,801,000) (20,770,000) (44,377,000) (43,353,000)
Eliminations [Member] | Regulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (15,920,000) (14,366,000) (32,606,000) (29,528,000)
Eliminations [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (63,000) (60,000) (123,000) (129,000)
Eliminations [Member] | Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax (5,818,000) (6,344,000) (11,648,000) (13,696,000)
Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 46,000 45,000 91,000 91,000
Other [Member] | Unregulated Energy [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0
Other [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 46,000 $ 45,000 $ 91,000 $ 91,000
[1] ) Total operating revenues for the three months ended June 30, 2024 include other revenue (revenues from sources other than contracts with customers) of $0.1 million for both our Regulated and Unregulated Energy segments, and $0.2 million and $0.1 million for our Regulated and Unregulated Energy segments, respectively, for the three months ended June 30, 2023. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for the Maryland division and Sandpiper Energy and late fees.
[2] (1) Total operating revenues for the six months ended June 30, 2024 include other revenue (revenues from sources other than contracts with customers) of $0.7 million and $0.2 million for our Regulated and Unregulated Energy segments, respectively, and $0.8 million and $0.2 million for our Regulated and Unregulated Energy segments, respectively, for the six months ended June 30, 2023. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for the Maryland division and Sandpiper Energy and late fees