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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block] The following table displays our revenue from continuing operations by major source based on product and service type for the three months ended March 31, 2021 and 2020:
Three months ended March 31, 2021Three Months Ended March 31, 2020
(in thousands)Regulated EnergyUnregulated EnergyOther and EliminationsTotalRegulated EnergyUnregulated EnergyOther and EliminationsTotal
Energy distribution
Delaware natural gas division$33,272 $— $— $33,272 $26,567 $— $— $26,567 
Florida natural gas division8,956 — — 8,956 8,477 — — 8,477 
FPU electric distribution18,551 — — 18,551 14,219 — — 14,219 
FPU natural gas distribution26,861 — — 26,861 25,444 — — 25,444 
Maryland natural gas division 10,466 — — 10,466 9,138 — — 9,138 
Sandpiper natural gas/propane operations8,071 — — 8,071 6,292 — — 6,292 
Elkton Gas2,635 — — 2,635 — — — — 
Total energy distribution108,812 — — 108,812 90,137 — — 90,137 
Energy transmission
Aspire Energy— 12,905 — 12,905 — 9,781 — 9,781 
Aspire Energy Express47 — — 47 — — — — 
Eastern Shore19,972 — — 19,972 19,279 — — 19,279 
Peninsula Pipeline6,467 — — 6,467 4,824 — — 4,824 
Total energy transmission26,486 12,905 — 39,391 24,103 9,781 — 33,884 
Energy generation
Eight Flags— 4,329 — 4,329 — 4,323 — 4,323 
Propane operations
Propane delivery operations— 55,264 — 55,264 — 38,623 — 38,623 
Energy delivery services
Marlin Gas Services— 2,352 — 2,352 — 1,309 — 1,309 
Other and eliminations
Eliminations(14,101)(91)(4,901)(19,093)(11,285)(24)(4,409)(15,718)
Other— — 132 132 — — 132 132 
Total other and eliminations(14,101)(91)(4,769)(18,961)(11,285)(24)(4,277)(15,586)
Total operating revenues (1)
$121,197 $74,759 $(4,769)$191,187 $102,955 $54,012 $(4,277)$152,690 
(1) Total operating revenues for the three months ended March 31, 2021, include other revenue (revenues from sources other than contracts with customers) of $(0.3) million and $0.1 million for our Regulated and Unregulated Energy segments, respectively, and $0.7 million and $0.1 million for our Regulated and Unregulated Energy segments, respectively, for the three months ended March 31, 2020. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for the Maryland division and Sandpiper 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 March 31, 2021 and December 31, 2020 were as follows:
Trade ReceivablesContract Assets (Current)Contract Assets (Non-current)Contract Liabilities (Current)
(in thousands)
Balance at 12/31/2020$55,600 $18 $4,816 $644 
Balance at 3/31/202156,577 18 5,034 433 
Increase (decrease)$977 $— $218 $(211)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Revenue for these businesses for the remaining performance obligations, at March 31, 2021, are expected to be recognized as follows:
(in thousands)2021202220232024202520262027 and thereafter
Eastern Shore and Peninsula Pipeline$26,814 $30,415 $23,129 $20,970 $20,117 $19,387 $156,500 
Natural gas distribution operations4,239 6,521 6,064 5,835 5,299 5,071 33,465 
FPU electric distribution489 652 652 652 275 275 550 
Total revenue contracts with remaining performance obligations$31,542 $37,588 $29,845 $27,457 $25,691 $24,733 $190,515