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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2022
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block] The following table displays our revenue by major source based on product and service type for the three months ended September 30, 2022 and 2021:
Three months ended September 30, 2022Three months ended September 30, 2021
(in thousands)Regulated EnergyUnregulated EnergyOther and EliminationsTotalRegulated EnergyUnregulated EnergyOther and EliminationsTotal
Energy distribution
Delaware natural gas division$8,741 $— $— $8,741 $7,849 $— $— $7,849 
Florida natural gas division9,207 — — 9,207 8,015 — — 8,015 
FPU electric distribution25,199 — — 25,199 23,121 — — 23,121 
FPU natural gas distribution26,627 — — 26,627 22,012 — — 22,012 
Maryland natural gas division 2,881 — — 2,881 2,432 — — 2,432 
Sandpiper natural gas/propane operations3,893 — — 3,893 3,553 — — 3,553 
Elkton Gas1,168 — — 1,168 915 — — 915 
Total energy distribution77,716 — — 77,716 67,897 — — 67,897 
Energy transmission
Aspire Energy— 10,022 — 10,022 — 5,255 — 5,255 
Aspire Energy Express373 — — 373 47 — — 47 
Eastern Shore18,804 — — 18,804 18,558 — — 18,558 
Peninsula Pipeline6,813 — — 6,813 6,776 — — 6,776 
Total energy transmission25,990 10,022 — 36,012 25,381 5,255 — 30,636 
Energy generation
Eight Flags— 7,414 — 7,414 — 4,583 — 4,583 
Propane operations
Propane delivery operations— 27,923 — 27,923 — 20,680 — 20,680 
Compressed Natural Gas Services
Marlin Gas Services— 2,642 — 2,642 — 1,678 — 1,678 
Other and eliminations
Eliminations(12,726)(87)(7,886)(20,699)(12,882)(87)(5,302)(18,271)
Other— — 45 45 — — 132 132 
Total other and eliminations(12,726)(87)(7,841)(20,654)(12,882)(87)(5,170)(18,139)
Total operating revenues (1)
$90,980 $47,914 $(7,841)$131,053 $80,396 $32,109 $(5,170)$107,335 
(1) Total operating revenues include other revenue (revenues from sources other than contracts with customers) of $0.1 million for both of our Regulated and Unregulated Energy segments, respectively for all periods presented above. 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.

The following table displays our revenue by major source based on product and service type for the nine months ended September 30, 2022 and 2021:
Nine Months Ended September 30, 2022Nine Months Ended September 30, 2021
(in thousands)Regulated EnergyUnregulated EnergyOther and EliminationsTotalRegulated EnergyUnregulated EnergyOther and EliminationsTotal
Energy distribution
Delaware natural gas division$56,308 $— $— $56,308 $51,188 $— $— $51,188 
Florida natural gas division29,093 — — 29,093 25,417 — — 25,417 
FPU electric distribution64,593 — — 64,593 60,569 — — 60,569 
FPU natural gas distribution82,463 — — 82,463 72,032 — — 72,032 
Maryland natural gas division 17,717 — — 17,717 16,122 — — 16,122 
Sandpiper natural gas/propane operations15,777 — — 15,777 15,438 — — 15,438 
Elkton Gas6,239 — — 6,239 4,745 — — 4,745 
Total energy distribution272,190 — — 272,190 245,511 — — 245,511 
Energy transmission
Aspire Energy— 38,866 — 38,866 — 23,738 — 23,738 
Aspire Energy Express1,004 — — 1,004 140 — — 140 
Eastern Shore58,000 — — 58,000 57,147 — — 57,147 
Peninsula Pipeline20,361 — — 20,361 19,853 — — 19,853 
Total energy transmission79,365 38,866 — 118,231 77,140 23,738 — 100,878 
Energy generation
Eight Flags— 18,868 — 18,868 — 13,086 — 13,086 
Propane operations
Propane delivery operations— 137,997 — 137,997 — 99,041 — 99,041 
Compressed Natural Gas Services
Marlin Gas Services— 7,231 — 7,231 — 6,019 — 6,019 
Other and eliminations
Eliminations(40,491)(293)(20,592)(61,376)(40,148)(242)(14,937)(55,327)
Other— — 262 262 — — 396 396 
Total other and eliminations(40,491)(293)(20,330)(61,114)(40,148)(242)(14,541)(54,931)
Total operating revenues (1)
$311,064 $202,669 $(20,330)$493,403 $282,503 $141,642 $(14,541)$409,604 
(1) Total operating revenues for the nine months ended September 30, 2022, include other revenue (revenues from sources other than contracts with customers) of $0.2 million for Regulated and $0.3 million 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, 2021. 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.
Contract with Customer, Asset and Liability [Table Text Block] The balances of our trade receivables, contract assets, and contract liabilities as of September 30, 2022 and December 31, 2021 were as follows:
Trade ReceivablesContract Assets (Current)Contract Assets (Non-current)Contract Liabilities (Current)
(in thousands)
Balance at 12/31/2021$56,277 $18 $4,806 $747 
Balance at 9/30/2022
36,384 18 4,700 1,139 
Decrease$(19,893)$— $(106)$392 
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Revenue for these businesses for the remaining performance obligations, at September 30, 2022, are expected to be recognized as follows:
(in thousands)2022202320242025202620272028 and thereafter
Eastern Shore and Peninsula Pipeline$10,366 $36,011 $32,755 $26,516 $23,071 $20,163 $159,782 
Natural gas distribution operations1,678 6,285 6,105 5,747 5,516 5,100 33,113 
FPU electric distribution163 652 652 275 275 275 275 
Total revenue contracts with remaining performance obligations$12,207 $42,948 $39,512 $32,538 $28,862 $25,538 $193,170