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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2022 and 2021:
Three months ended March 31, 2022Three months ended March 31, 2021
(in thousands)Regulated EnergyUnregulated EnergyOther and EliminationsTotalRegulated EnergyUnregulated EnergyOther and EliminationsTotal
Energy distribution
Delaware natural gas division$34,481 $— $— $34,481 $33,272 $— $— $33,272 
Florida natural gas division10,266 — — 10,266 8,956 — — 8,956 
FPU electric distribution19,089 — — 19,089 18,551 — — 18,551 
FPU natural gas distribution30,020 — — 30,020 26,861 — — 26,861 
Maryland natural gas division 10,464 — — 10,464 10,466 — — 10,466 
Sandpiper natural gas/propane operations7,636 — — 7,636 8,071 — — 8,071 
Elkton Gas3,366 — — 3,366 2,635 — — 2,635 
Total energy distribution115,322 — — 115,322 108,812 — — 108,812 
Energy transmission
Aspire Energy— 18,036 — 18,036 — 12,905 — 12,905 
Aspire Energy Express263 — — 263 47 — — 47 
Eastern Shore20,321 — — 20,321 19,972 — — 19,972 
Peninsula Pipeline6,772 — — 6,772 6,467 — — 6,467 
Total energy transmission27,356 18,036 — 45,392 26,486 12,905 — 39,391 
Energy generation
Eight Flags— 5,539 — 5,539 — 4,329 — 4,329 
Propane operations
Propane delivery operations— 75,606 — 75,606 — 55,264 — 55,264 
Compressed Natural Gas Services
Marlin Gas Services— 2,209 — 2,209 — 2,352 — 2,352 
Other and eliminations
Eliminations(14,787)(98)(6,435)(21,320)(14,101)(91)(4,901)(19,093)
Other— — 132 132 — — 132 132 
Total other and eliminations(14,787)(98)(6,303)(21,188)(14,101)(91)(4,769)(18,961)
Total operating revenues (1)
$127,891 $101,292 $(6,303)$222,880 $121,197 $74,759 $(4,769)$191,187 
(1) Total operating revenues for the three months ended March 31, 2022, include other revenue (revenues from sources other than contracts with customers) of $0.1 million for both Regulated and Unregulated Energy segments, respectively, and $(0.3) million and $0.1 million for our Regulated and Unregulated Energy segments, respectively, for the three months ended March 31, 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 March 31, 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 $747 
Balance at 3/31/202250,440 18 4,743 504 
Increase (decrease)$(5,837)$— $(63)$(243)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Revenue for these businesses for the remaining performance obligations, at March 31, 2022, are expected to be recognized as follows:
(in thousands)2022202320242025202620272028 and thereafter
Eastern Shore and Peninsula Pipeline$35,359 $44,475 $39,677 $33,050 $29,467 $25,228 $179,247 
Natural gas distribution operations5,010 5,681 5,458 4,928 4,745 4,406 27,089 
FPU electric distribution489 652 652 275 275 275 275 
Total revenue contracts with remaining performance obligations$40,858 $50,808 $45,787 $38,253 $34,487 $29,909 $206,611