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Revenue Recognition (Tables) | 9 Months Ended
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Sep. 30, 2020
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, 2020 and 2019:
|  | Three months ended September 30, 2020 |  | Three Months Ended September 30, 2019
(in thousands) |  | Regulated Energy |  | Unregulated Energy |  | Other and Eliminations |  | Total |  | Regulated Energy |  | Unregulated Energy |  | Other and Eliminations |  | Total
Energy distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Delaware natural gas division |  | $ | 7,243 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,243 |  |  | $ | 6,953 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,953 |
Florida natural gas division |  | 7,309 |  |  | — |  |  | — |  |  | 7,309 |  |  | 6,710 |  |  | — |  |  | — |  |  | 6,710 |
FPU electric distribution |  | 29,051 |  |  | — |  |  | — |  |  | 29,051 |  |  | 24,174 |  |  | — |  |  | — |  |  | 24,174 |
FPU natural gas distribution |  | 19,935 |  |  | — |  |  | — |  |  | 19,935 |  |  | 17,908 |  |  | — |  |  | — |  |  | 17,908 |
Maryland natural gas division |  | 2,824 |  |  | — |  |  | — |  |  | 2,824 |  |  | 2,634 |  |  | — |  |  | — |  |  | 2,634 |
Sandpiper natural gas/propane operations |  | 3,290 |  |  | — |  |  | — |  |  | 3,290 |  |  | 3,673 |  |  | — |  |  | — |  |  | 3,673 |
Elkton Gas |  | 623 |  |  | — |  |  | — |  |  | 623 |  |  | — |  |  | — |  |  | — |  |  | — |
Total energy distribution |  | 70,275 |  |  | — |  |  | — |  |  | 70,275 |  |  | 62,052 |  |  | — |  |  | — |  |  | 62,052 |
Energy transmission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aspire Energy |  | — |  |  | 3,449 |  |  | — |  |  | 3,449 |  |  | — |  |  | 4,247 |  |  | — |  |  | 4,247 |
Eastern Shore |  | 18,389 |  |  | — |  |  | — |  |  | 18,389 |  |  | 17,573 |  |  | — |  |  | — |  |  | 17,573 |
Peninsula Pipeline |  | 6,433 |  |  | — |  |  | — |  |  | 6,433 |  |  | 4,442 |  |  | — |  |  | — |  |  | 4,442 |
Total energy transmission |  | 24,822 |  |  | 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, 2020 |  | Nine months ended September 30, 2019
(in thousands) |  | Regulated Energy |  | Unregulated Energy |  | Other and Eliminations |  | Total |  | Regulated Energy |  | Unregulated Energy |  | Other and Eliminations |  | Total
Energy distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Delaware natural gas division |  | $ | 45,568 |  |  | $ | — |  |  | $ | — |  |  | $ | 45,568 |  |  | $ | 42,758 |  |  | $ | — |  |  | $ | — |  |  | $ | 42,758 |
Florida natural gas division |  | 23,018 |  |  | — |  |  | — |  |  | 23,018 |  |  | 21,625 |  |  | — |  |  | — |  |  | 21,625 |
FPU electric distribution |  | 58,972 |  |  | — |  |  | — |  |  | 58,972 |  |  | 59,016 |  |  | — |  |  | — |  |  | 59,016 |
FPU natural gas distribution |  | 64,877 |  |  | — |  |  | — |  |  | 64,877 |  |  | 60,357 |  |  | — |  |  | — |  |  | 60,357 |
Maryland natural gas division |  | 15,941 |  |  | — |  |  | — |  |  | 15,941 |  |  | 15,867 |  |  | — |  |  | — |  |  | 15,867 |
Sandpiper natural gas/propane operations |  | 12,440 |  |  | — |  |  | — |  |  | 12,440 |  |  | 14,237 |  |  | — |  |  | — |  |  | 14,237 |
Elkton Gas |  | 623 |  |  | — |  |  | — |  |  | 623 |  |  | — |  |  | — |  |  | — |  |  | — |
Total energy distribution |  | 221,439 |  |  | — |  |  | — |  |  | 221,439 |  |  | 213,860 |  |  | — |  |  | — |  |  | 213,860 |
Energy transmission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aspire Energy |  | — |  |  | 17,784 |  |  | — |  |  | 17,784 |  |  | — |  |  | 23,139 |  |  | — |  |  | 23,139 |
Eastern Shore |  | 55,944 |  |  | — |  |  | — |  |  | 55,944 |  |  | 54,368 |  |  | — |  |  | — |  |  | 54,368 |
Peninsula Pipeline |  | 16,618 |  |  | — |  |  | — |  |  | 16,618 |  |  | 11,573 |  |  | — |  |  | — |  |  | 11,573 |
Total energy transmission |  | 72,562 |  |  | 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 with Customer, Asset and Liability [Table Text Block] | The balances of our trade receivables, contract assets, and contract liabilities as of September 30, 2020 and December 31, 2019 were as follows:
|  | Trade Receivables |  | Contract Assets (Current) |  | Contract Assets (Non-current) |  | Contract Liabilities (Current)
(in thousands) |  |  |  |  |  |  |  |
Balance at 12/31/2019 |  | $ | 47,430 |  |  | $ | 18 |  |  | $ | 3,465 |  |  | $ | 589 |
Balance at 9/30/2020 |  | 37,190 |  |  | 18 |  |  | 4,537 |  |  | 971 |
Increase (decrease) |  | $ | (10,240) |  |  | $ | — |  |  | $ | 1,072 |  |  | $ | 382 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] | Revenue for these businesses for the remaining performance obligations, at September 30, 2020, are expected to be recognized as follows:
(in thousands) | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026 and thereafter
Eastern Shore and Peninsula Pipeline | $ | 9,115 |  |  | $ | 34,541 |  |  | $ | 27,047 |  |  | $ | 21,664 |  |  | $ | 19,587 |  |  | $ | 18,736 |  |  | $ | 174,774 |
Natural gas distribution operations | 970 |  |  | 4,351 |  |  | 5,394 |  |  | 4,937 |  |  | 4,705 |  |  | 4,172 |  |  | 32,996 |
FPU electric distribution | 141 |  |  | 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 |

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