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Revenue Recognition (Tables)
 6 Months Ended
Jun. 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 June 30, 2021 and 2020:
Three months ended June 30, 2021Three months ended June 30, 2020
(in thousands)Regulated EnergyUnregulated EnergyOther and EliminationsTotalRegulated EnergyUnregulated EnergyOther and EliminationsTotal
Energy distribution
Delaware natural gas division$10,068 $— $— $10,068 $11,758 $— $— $11,758 
Florida natural gas division8,446 — — 8,446 7,231 — — 7,231 
FPU electric distribution18,898 — — 18,898 15,701 — — 15,701 
FPU natural gas distribution23,159 — — 23,159 19,498 — — 19,498 
Maryland natural gas division 3,224 — — 3,224 3,979 — — 3,979 
Sandpiper natural gas/propane operations3,814 — — 3,814 2,858 — — 2,858 
Elkton Gas1,195 — — 1,195 — — — — 
Total energy distribution68,804 — — 68,804 61,025 — — 61,025 
Energy transmission
Aspire Energy— 5,578 — 5,578 — 4,554 — 4,554 
Aspire Energy Express47 — — 47 — — — — 
Eastern Shore18,617 — — 18,617 18,277 — — 18,277 
Peninsula Pipeline6,610 — — 6,610 5,361 — — 5,361 
Total energy transmission25,274 5,578 — 30,852 23,638 4,554 — 28,192 
Energy generation
Eight Flags— 4,173 — 4,173 — 3,694 — 3,694 
Propane operations
Propane delivery operations— 23,098 — 23,098 — 17,260 — 17,260 
Energy delivery services
Marlin Gas Services— 1,989 — 1,989 — 2,248 — 2,248 
Other and eliminations
Eliminations(13,168)(65)(4,734)(17,967)(11,145)(16)(4,340)(15,501)
Other— — 133 133 — — 133 133 
Total other and eliminations(13,168)(65)(4,601)(17,834)(11,145)(16)(4,207)(15,368)
Total operating revenues (1)
$80,910 $34,773 $(4,601)$111,082 $73,518 $27,740 $(4,207)$97,051 
(1) Total operating revenues for the three months ended June 30, 2021, include other revenue (revenues from sources other than contracts with customers) of $0.1 million and $0.09 million for our Regulated and Unregulated Energy segments, respectively, and $0.1 million and $0.04 million for our Regulated and Unregulated Energy segments, respectively, for the three months ended June 30, 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.


The following table displays our revenue from continuing operations by major source based on product and service type for the six months ended June 30, 2021 and 2020:
Six months ended June 30, 2021Six months ended June 30, 2020
(in thousands)Regulated EnergyUnregulated EnergyOther and EliminationsTotalRegulated EnergyUnregulated EnergyOther and EliminationsTotal
Energy distribution
Delaware natural gas division$43,340 $— $— $43,340 $38,325 $— $— $38,325 
Florida natural gas division17,402 — — 17,402 15,708 — — 15,708 
FPU electric distribution37,449 — — 37,449 29,920 — — 29,920 
FPU natural gas distribution50,020 — — 50,020 44,942 — — 44,942 
Maryland natural gas division 13,690 — — 13,690 13,117 — — 13,117 
Sandpiper natural gas/propane operations11,885 — — 11,885 9,150 — — 9,150 
Elkton Gas3,830 — — 3,830 — — — — 
Total energy distribution177,616 — — 177,616 151,162 — — 151,162 
Energy transmission
Aspire Energy— 18,484 — 18,484 — 14,335 — 14,335 
Aspire Energy Express93 — — 93 — — — — 
Eastern Shore38,589 — — 38,589 37,556 — — 37,556 
Peninsula Pipeline13,077 — — 13,077 10,185 — — 10,185 
Total energy transmission51,759 18,484 — 70,243 47,741 14,335 — 62,076 
Energy generation
Eight Flags— 8,502 — 8,502 — 8,017 — 8,017 
Propane operations
Propane delivery operations— 78,361 — 78,361 — 55,882 — 55,882 
Energy delivery services
Marlin Gas Services— 4,340 — 4,340 — 3,557 — 3,557 
Other and eliminations
Eliminations(27,268)(156)(9,635)(37,059)(22,430)(39)(8,749)(31,218)
Other— 265 265 — — 265 265 
Total other and eliminations(27,268)(156)(9,370)(36,794)(22,430)(39)(8,484)(30,953)
Total operating revenues (1)
$202,107 $109,531 $(9,370)$302,268 $176,473 $81,752 $(8,484)$249,741 
(1) Total operating revenues for the six months ended June 30, 2021, include other revenue (revenues from sources other than contracts with customers) of $(0.2) million and $0.2 million for our Regulated and Unregulated Energy segments, respectively, and $0.8 million and $0.1 million for our Regulated and Unregulated Energy segments, respectively, for the six months ended June 30, 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 June 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 $644 
Balance at 6/30/202137,341 18 5,179 342 
Increase (decrease)$(18,259)$— $363 $(302)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Revenue for these businesses for the remaining performance obligations, at June 30, 2021, are expected to be recognized as follows:
(in thousands)2021202220232024202520262027 and thereafter
Eastern Shore and Peninsula Pipeline$18,561 $31,914 $24,570 $22,402 $21,550 $20,494 $176,316 
Natural gas distribution operations3,005 6,501 6,039 5,807 5,266 5,062 33,448 
FPU electric distribution489 652 652 652 275 275 550 
Total revenue contracts with remaining performance obligations$22,055 $39,067 $31,261 $28,861 $27,091 $25,831 $210,314