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Revenue Recognition (Notes)
 9 Months Ended
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer [Text Block] Revenue RecognitionWe recognize revenue when our performance obligations under contracts with customers have been satisfied, which generally occurs when our businesses have delivered or transported natural gas, electricity or propane to customers. We exclude sales taxes and other similar taxes from the transaction price. Typically, our customers pay for the goods and/or services we provide in the month following the satisfaction of our performance obligation. The revenues in the following tables exclude operating revenues from PESCO that are reflected as discontinued operations. 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, 2020 and 2019:
Three months ended September 30, 2020Three Months Ended September 30, 2019
(in thousands)Regulated EnergyUnregulated EnergyOther and EliminationsTotalRegulated EnergyUnregulated EnergyOther and EliminationsTotal
Energy distribution
Delaware natural gas division$7,243 $— $— $7,243 $6,953 $— $— $6,953 
Florida natural gas division7,309 — — 7,309 6,710 — — 6,710 
FPU electric distribution29,051 — — 29,051 24,174 — — 24,174 
FPU natural gas distribution19,935 — — 19,935 17,908 — — 17,908 
Maryland natural gas division 2,824 — — 2,824 2,634 — — 2,634 
Sandpiper natural gas/propane operations3,290 — — 3,290 3,673 — — 3,673 
Elkton Gas623 — — 623 — — — — 
Total energy distribution70,275 — — 70,275 62,052 — — 62,052 
Energy transmission
Aspire Energy— 3,449 — 3,449 — 4,247 — 4,247 
Eastern Shore18,389 — — 18,389 17,573 — — 17,573 
Peninsula Pipeline6,433 — — 6,433 4,442 — — 4,442 
Total energy transmission24,822 3,449 — 28,271 22,015 4,247 — 26,262 
Energy generation
Eight Flags— 3,882 — 3,882 — 4,027 — 4,027 
Propane operations
Propane delivery operations— 13,710 — 13,710 — 14,200 — 14,200 
Energy delivery services
Marlin Gas Services— 1,708 — 1,708 — 1,059 — 1,059 
Other and eliminations
Eliminations(12,335)(35)(4,188)(16,558)(9,487)(1,253)(4,367)(15,107)
Other— — 131 131 — — 133 133 
Total other and eliminations(12,335)(35)(4,057)(16,427)(9,487)(1,253)(4,234)(14,974)
Total operating revenues (1)
$82,762 $22,714 $(4,057)$101,419 $74,580 $22,280 $(4,234)$92,626 
(1) Total operating revenues for the three months ended September 30, 2020, include other revenue (revenues from sources other than contracts with customers) of $0.2 million and $0.05 million for our Regulated and Unregulated Energy segments, respectively, and $0.1 million and $0.1 million for our Regulated and Unregulated Energy segments, respectively, for the three months ended September 30, 2019. 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 nine months ended September 30, 2020 and 2019:
Nine months ended September 30, 2020Nine months ended September 30, 2019
(in thousands)Regulated EnergyUnregulated EnergyOther and EliminationsTotalRegulated EnergyUnregulated EnergyOther and EliminationsTotal
Energy distribution
Delaware natural gas division$45,568 $— $— $45,568 $42,758 $— $— $42,758 
Florida natural gas division23,018 — — 23,018 21,625 — — 21,625 
FPU electric distribution58,972 — — 58,972 59,016 — — 59,016 
FPU natural gas distribution64,877 — — 64,877 60,357 — — 60,357 
Maryland natural gas division 15,941 — — 15,941 15,867 — — 15,867 
Sandpiper natural gas/propane operations12,440 — — 12,440 14,237 — — 14,237 
Elkton Gas623 — — 623 — — — — 
Total energy distribution221,439 — — 221,439 213,860 — — 213,860 
Energy transmission
Aspire Energy— 17,784 — 17,784 — 23,139 — 23,139 
Eastern Shore55,944 — — 55,944 54,368 — — 54,368 
Peninsula Pipeline16,618 — — 16,618 11,573 — — 11,573 
Total energy transmission72,562 17,784 — 90,346 65,941 23,139 — 89,080 
Energy generation
Eight Flags— 11,898 — 11,898 — 12,405 — 12,405 
Propane operations
Propane delivery operations— 69,593 — 69,593 — 78,217 — 78,217 
Energy delivery services
Marlin Gas Services— 5,266 — 5,266 — 4,601 — 4,601 
Other and eliminations
Eliminations(34,766)(75)(12,937)(47,778)(28,200)(9,377)(13,351)(50,928)
Other— — 396 396 — — 395 395 
Total other and eliminations(34,766)(75)(12,541)(47,382)(28,200)(9,377)(12,956)(50,533)
Total operating revenues (1)
$259,235 $104,466 $(12,541)$351,160 $251,601 $108,985 $(12,956)$347,630 
(1) Total operating revenues for the nine months ended September 30, 2020, include other revenue (revenues from sources other than contracts with customers) of $1.0 million and $0.2 million for our Regulated and 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, 2019. 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 balances
The timing of revenue recognition, customer billings and cash collections results in trade receivables, unbilled receivables (contract assets), and customer advances (contract liabilities) in our condensed consolidated balance sheets. The balances of our trade receivables, contract assets, and contract liabilities as of September 30, 2020 and December 31, 2019 were as follows:
Trade ReceivablesContract Assets (Current)Contract Assets (Non-current)Contract Liabilities (Current)
(in thousands)
Balance at 12/31/2019$47,430 $18 $3,465 $589 
Balance at 9/30/202037,190 18 4,537 971 
Increase (decrease)$(10,240)$— $1,072 $382 
Our trade receivables are included in trade and other receivables in the condensed consolidated balance sheets. Our current contract assets are included in other current assets in the condensed consolidated balance sheet. Our non-current contract assets are included in other assets in the condensed consolidated balance sheet and primarily relate to operations and maintenance costs incurred by Eight Flags that have not yet been recovered through rates for the sale of electricity to our electric distribution operation pursuant to a long-term service agreement.

At times, we receive advances or deposits from our customers before we satisfy our performance obligation, resulting in contract liabilities. Contract liabilities are included in other accrued liabilities in the condensed consolidated balance sheets and relate to non-refundable prepaid fixed fees for our Mid-Atlantic propane delivery operation's retail offerings. Our performance obligation is satisfied over the term of the respective retail offering plan on a ratable basis. For each of the three months ended September 30, 2020 and 2019, we recognized revenue of $0.2 million. For the nine months ended September 30, 2020 and 2019, we recognized revenue of $0.8 million and $0.7 million, respectively.

Remaining performance obligations
Our businesses have long-term fixed fee contracts with customers in which revenues are recognized when performance obligations are satisfied over the contract term. Revenue for these businesses for the remaining performance obligations, at September 30, 2020, are expected to be recognized as follows:
(in thousands)2020202120222023202420252026 and thereafter
Eastern Shore and Peninsula Pipeline$9,115 $34,541 $27,047 $21,664 $19,587 $18,736 $174,774 
Natural gas distribution operations970 4,351 5,394 4,937 4,705 4,172 32,996 
FPU electric distribution141 566 566 566 566 275 825 
Total revenue contracts with remaining performance obligations$10,226 $39,458 $33,007 $27,167 $24,858 $23,183 $208,595