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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2021 and 2020:
Three months ended September 30, 2021Three months ended September 30, 2020
(in thousands)Regulated EnergyUnregulated EnergyOther and EliminationsTotalRegulated EnergyUnregulated EnergyOther and EliminationsTotal
Energy distribution
Delaware natural gas division$7,849 $— $— $7,849 $7,243 $— $— $7,243 
Florida natural gas division8,015 — — 8,015 7,309 — — 7,309 
FPU electric distribution23,121 — — 23,121 29,051 — — 29,051 
FPU natural gas distribution22,012 — — 22,012 19,935 — — 19,935 
Maryland natural gas division 2,432 — — 2,432 2,824 — — 2,824 
Sandpiper natural gas/propane operations3,553 — — 3,553 3,290 — — 3,290 
Elkton Gas915 — — 915 623 — — 623 
Total energy distribution67,897 — — 67,897 70,275 — — 70,275 
Energy transmission
Aspire Energy— 5,255 — 5,255 — 3,449 — 3,449 
Aspire Energy Express47 — — 47 — — — — 
Eastern Shore18,558 — — 18,558 18,389 — — 18,389 
Peninsula Pipeline6,776 — — 6,776 6,433 — — 6,433 
Total energy transmission25,381 5,255 — 30,636 24,822 3,449 — 28,271 
Energy generation
Eight Flags— 4,583 — 4,583 — 3,882 — 3,882 
Propane operations
Propane delivery operations— 20,680 — 20,680 — 13,710 — 13,710 
Energy delivery services
Marlin Gas Services— 1,678 — 1,678 — 1,708 — 1,708 
Other and eliminations
Eliminations(12,882)(87)(5,302)(18,271)(12,335)(35)(4,188)(16,558)
Other— — 132 132 — — 131 131 
Total other and eliminations(12,882)(87)(5,170)(18,139)(12,335)(35)(4,057)(16,427)
Total operating revenues (1)
$80,396 $32,109 $(5,170)$107,335 $82,762 $22,714 $(4,057)$101,419 
(1) Total operating revenues for the three months ended September 30, 2021, include other revenue (revenues from sources other than contracts with customers) of $0.1 million for both Regulated and Unregulated Energy segments, respectively, and $0.2 million and $0.05 million for our Regulated and Unregulated Energy segments, respectively, for the three months ended September 30, 2020. 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 from continuing operations by major source based on product and service type for the nine months ended September 30, 2021 and 2020:

Nine months ended September 30, 2021Nine months ended September 30, 2020
(in thousands)Regulated EnergyUnregulated EnergyOther and EliminationsTotalRegulated EnergyUnregulated EnergyOther and EliminationsTotal
Energy distribution
Delaware natural gas division$51,188 $— $— $51,188 $45,568 $— $— $45,568 
Florida natural gas division25,417 — — 25,417 23,018 — — 23,018 
FPU electric distribution60,569 — — 60,569 58,972 — — 58,972 
FPU natural gas distribution72,032 — — 72,032 64,877 — — 64,877 
Maryland natural gas division 16,122 — — 16,122 15,941 — — 15,941 
Sandpiper natural gas/propane operations15,438 — — 15,438 12,440 — — 12,440 
Elkton Gas4,745 — — 4,745 623 — — 623 
Total energy distribution245,511 — — 245,511 221,439 — — 221,439 
Energy transmission
Aspire Energy— 23,738 — 23,738 — 17,784 — 17,784 
Aspire Energy Express140 — — 140 — — — — 
Eastern Shore57,147 — — 57,147 55,944 — — 55,944 
Peninsula Pipeline19,853 — — 19,853 16,618 — — 16,618 
Total energy transmission77,140 23,738 — 100,878 72,562 17,784 — 90,346 
Energy generation
Eight Flags— 13,086 — 13,086 — 11,898 — 11,898 
Propane operations
Propane delivery operations— 99,041 — 99,041 — 69,593 — 69,593 
Energy delivery services
Marlin Gas Services— 6,019 — 6,019 — 5,266 — 5,266 
Other and eliminations
Eliminations(40,148)(242)(14,937)(55,327)(34,766)(75)(12,937)(47,778)
Other— 396 396 — — 396 396 
Total other and eliminations(40,148)(242)(14,541)(54,931)(34,766)(75)(12,541)(47,382)
Total operating revenues (1)
$282,503 $141,642 $(14,541)$409,604 $259,235 $104,466 $(12,541)$351,160 
(1) Total operating revenues for the nine months ended September 30, 2021, include other revenue (revenues from sources other than contracts with customers) of $(0.1) million and $0.3 million for our Regulated and Unregulated Energy segments, respectively, and $1.0 million and $0.2 million for our Regulated and Unregulated Energy segments, respectively, for the nine months ended September 30, 2020. 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, 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 $644 
Balance at 9/30/202140,683 18 5,011 874 
Increase (decrease)$(14,917)$— $195 $230 
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Revenue for these businesses for the remaining performance obligations, at September 30, 2021, are expected to be recognized as follows:
(in thousands)2021202220232024202520262027 and thereafter
Eastern Shore and Peninsula Pipeline$9,471 $32,796 $25,205 $22,975 $22,102 $21,023 $179,728 
Natural gas distribution operations1,752 6,620 6,044 5,811 5,271 5,064 33,448 
FPU electric distribution163 652 652 652 275 275 550 
Total revenue contracts with remaining performance obligations$11,386 $40,068 $31,901 $29,438 $27,648 $26,362 $213,726