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Revenue Recognition Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2018
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 twelve months ended December 31, 2018:
(in thousands) |  | Regulated Energy |  | Unregulated Energy |  | Other and Eliminations |  | Total
Energy distribution |  |  |  |  |  |  |  |
Delaware natural gas division |  | $ | 70,338 |  |  | $ | — |  |  | $ | — |  |  | $ | 70,338 |
Florida natural gas division |  | 25,341 |  |  | — |  |  | — |  |  | 25,341 |
FPU electric distribution |  | 79,803 |  |  | — |  |  | — |  |  | 79,803 |
FPU natural gas distribution |  | 81,118 |  |  | — |  |  | — |  |  | 81,118 |
Maryland natural gas division |  | 24,172 |  |  | — |  |  | — |  |  | 24,172 |
Sandpiper natural gas/propane operations |  | 22,088 |  |  | — |  |  | — |  |  | 22,088 |
Total energy distribution |  | 302,860 |  |  | — |  |  | — |  |  | 302,860 |
Energy transmission |  |  |  |  |  |  |  |
Aspire Energy |  | — |  |  | 35,407 |  |  | — |  |  | 35,407 |
Eastern Shore |  | 64,248 |  |  | — |  |  | — |  |  | 64,248 |
Peninsula Pipeline |  | 11,927 |  |  | — |  |  | — |  |  | 11,927 |
Total energy transmission |  | 76,175 |  |  | 35,407 |  |  | — |  |  | 111,582 |
Energy generation |  |  |  |  |  |  |  |
Eight Flags |  | — |  |  | 17,302 |  |  | — |  |  | 17,302 |
Propane operations |  |  |  |  |  |  |  |
Mid-Atlantic propane operations |  | — |  |  | 102,321 |  |  | — |  |  | 102,321 |
Florida propane operations |  | — |  |  | 21,282 |  |  | — |  |  | 21,282 |
Total propane operations |  | — |  |  | 123,603 |  |  | — |  |  | 123,603 |
Energy services |  |  |  |  |  |  |  |
Marlin Gas Services |  | — |  |  | 121 |  |  | — |  |  | 121 |
PESCO - Natural Gas Marketing |  | — |  |  | 258,713 |  |  | — |  |  | 258,713 |
|  | — |  |  | 258,834 |  |  | — |  |  | 258,834 |
Other and eliminations |  |  |  |  |  |  |  |
Eliminations |  | (33,754 | ) |  | (16,486 | ) |  | (49,062 | ) |  | (99,302 | )
Other |  | — |  |  | 1,957 |  |  | 653 |  |  | 2,610 |
Total other and eliminations |  | (33,754 | ) |  | (14,529 | ) |  | (48,409 | ) |  | (96,692 | )
Total operating revenues (1) |  | $ | 345,281 |  |  | $ | 420,617 |  |  | $ | (48,409 | ) |  | $ | 717,489 |
(1) Includes other revenue (revenues from sources other than contracts with customers) of $236,000 and $334,000 for our Regulated and Unregulated Energy segments, respectively. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for 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 December 31, 2018 and 2017 were as follows:
|  | Trade Receivables |  | Contract Assets (Non-current) |  | Contract Liabilities (Current)
(in thousands) |  |  |  |  |  |
Balance at 12/31/2017 |  | $ | 74,962 |  |  | $ | 1,270 |  |  | $ | 407 |
Balance at 12/31/2018 |  | 83,214 |  |  | 2,614 |  |  | 480 |
Increase (decrease) |  | $ | 8,252 |  |  | $ | 1,344 |  |  | $ | 73 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] | Revenue for these businesses for the remaining performance obligations at December 31, 2018 are expected to be recognized as follows:
(in thousands) | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 and thereafter
Eastern Shore and Peninsula Pipeline | $ | 38,505 |  |  | $ | 36,768 |  |  | $ | 33,510 |  |  | $ | 26,566 |  |  | $ | 21,146 |  |  | $ | 212,620 |
Natural gas distribution operations | 4,109 |  |  | 3,586 |  |  | 3,358 |  |  | 3,320 |  |  | 2,924 |  |  | 30,826 |
PESCO - Natural Gas Marketing | 8,886 |  |  | 4,702 |  |  | 1,728 |  |  | 23 |  |  | — |  |  | — |
FPU electric distribution | 297 |  |  | 297 |  |  | 297 |  |  | 109 |  |  | — |  |  | — |
Total revenue contracts with remaining performance obligations | $ | 51,797 |  |  | $ | 45,353 |  |  | $ | 38,893 |  |  | $ | 30,018 |  |  | $ | 24,070 |  |  | $ | 243,446 |

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