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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] | The following table is a breakdown of our revenue by major source based on product and service type for the three months ended March 31, 2018:
|  | Regulated Energy |  | Unregulated Energy |  | Other and Eliminations |  | Total
Energy distribution |  |  |  |  |  |  |  |
Florida natural gas division |  | $ | 5,864 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,864 |
Delaware natural gas division |  | 32,072 |  |  | — |  |  | — |  |  | 32,072 |
FPU electric distribution |  | 18,741 |  |  | — |  |  | — |  |  | 18,741 |
FPU natural gas distribution |  | 23,213 |  |  | — |  |  | — |  |  | 23,213 |
Maryland natural gas division |  | 10,672 |  |  | — |  |  | — |  |  | 10,672 |
Sandpiper |  | 8,964 |  |  | — |  |  | — |  |  | 8,964 |
Total energy distribution |  | 99,526 |  |  | — |  |  | — |  |  | 99,526 |
Energy transmission |  |  |  |  |  |  |  |
Aspire Energy |  | — |  |  | 12,077 |  |  | — |  |  | 12,077 |
Eastern Shore |  | 15,597 |  |  | — |  |  | — |  |  | 15,597 |
Peninsula Pipeline |  | 2,098 |  |  | — |  |  | — |  |  | 2,098 |
Total energy transmission |  | 17,695 |  |  | 12,077 |  |  | — |  |  | 29,772 |
Energy generation |  |  |  |  |  |  |  |
Eight Flags |  | — |  |  | 4,378 |  |  | — |  |  | 4,378 |
Propane delivery |  |  |  |  |  |  |  |
Delmarva Peninsula propane delivery |  | — |  |  | 45,470 |  |  | — |  |  | 45,470 |
Florida propane delivery |  | — |  |  | 6,634 |  |  | — |  |  | 6,634 |
Total propane delivery |  | — |  |  | 52,104 |  |  | — |  |  | 52,104 |
Energy services |  |  |  |  |  |  |  |
PESCO |  | — |  |  | 81,559 |  |  | — |  |  | 81,559 |
Other and eliminations |  |  |  |  |  |  |  |
Eliminations |  | (7,828 | ) |  | (5,245 | ) |  | (15,598 | ) |  | (28,671 | )
Other |  | — |  |  | 494 |  |  | 194 |  |  | 688 |
Total other and eliminations |  | (7,828 | ) |  | (4,751 | ) |  | (15,404 | ) |  | (27,983 | )
Total operating revenues (1) |  | $ | 109,393 |  |  | $ | 145,367 |  |  | $ | (15,404 | ) |  | $ | 239,356 |
(1) Includes other revenue (revenues from sources other than contracts with customers) of $(589,000) and $73,000 for our Regulated and Unregulated Energy segments, respectively. The sources of other revenues include revenue from alternative revenue programs related to weather normalization for Maryland division and Sandpiper and late fees.
Contract with Customer, Asset and Liability [Table Text Block] | The opening and closing balances of our trade receivables, contract assets, and contract liability are as follows:
|  | Trade Receivables |  | Contract Assets (Non-current) |  | Contract Liability (Current)
in thousands |  |  |  |  |  |
Balance at 12/31/2017 |  | $ | 74,962 |  |  | $ | 1,270 |  |  | $ | 407 |
Balance at 3/31/2018 |  | 67,828 |  |  | 1,305 |  |  | 244 |
Increase (decrease) |  | $ | (7,134 | ) |  | $ | 35 |  |  | $ | (163 | )

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