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Rates and Other Regulatory Activities Summary of Effects of Tax Reform Impact on Regulated Businesses (Tables) | 12 Months Ended
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Dec. 31, 2018
Summary of Effects of Federal Tax Reform on Regulated Businesses [Abstract] |
Summary of Effects of Federal Tax Reform on Regulated Businesses [Table Text Block] | Summary TCJA Table
|  | Regulatory Liabilities related to Excess Accumulated Deferred Income Taxes ("ADIT") |  | Status of Customer Rate impact related to 35 percent to 21 percent rate change
Operation and Regulatory Jurisdiction |  | Amount (in thousands) | Status |  |
Eastern Shore (FERC) |  | $34,190 | Will be addressed in Eastern Shore's next rate case filing |  | Implemented one-time bill credit (totaling $900,000) in April 2018 - Customer rates adjusted in April, 2018
Delaware Division (Delaware PSC) |  | $13,262 | In January 2019, PSC approved amortization of ADIT and corresponding customer rate reductions effective March 1, 2019. |  | Customer rates to be adjusted March 1, 2019. One-time bill credit to be implemented during the second quarter.
Maryland Division (Maryland PSC) |  | $4,211 | In May 2018, PSC approved amortization of ADIT and corresponding customer rate reductions commenced |  | Implemented one-time bill credit (totaling $365,000) in July 2018 - Customer rates adjusted effective May 1, 2018
Sandpiper Energy (Maryland PSC) |  | $3,815 | In May 2018, PSC approved amortization of ADIT and corresponding customer rate reductions commenced |  | Implemented one-time bill credit (totaling $608,000) in July 2018 - Customer rates adjusted effective May 1, 2018
Chesapeake Florida Gas Division/Central Florida Gas (Florida PSC) |  | $8,471 | PSC Staff recommendation issued on January 24, 2019; final order was issued on February 25, 2019 |  | PSC Staff recommendation issued on January 24, 2019; final order was issued on February 25, 2019
|  |  | The order states that the net ADIT liability would be amortized and retained by the Company pursuant to the prescribed schedule |  | No one-time bill credit or adjustment in rates would be applied; the tax savings arising from the TCJA rate reduction would be retained
FPU Natural Gas (includes FPU, Fort Meade, and Indiantown) (Florida PSC) |  | $19,505 | PSC Staff recommendation issued on January 24, 2019; final order was issued on February 25, 2019 |  | PSC Staff recommendation issued on January 24, 2019; final order was issued on February 25, 2019
|  |  | The order states that the net ADIT liability would be amortized and retained by the Company pursuant to the prescribed schedule |  | No one-time bill credit or adjustment in rates would be applied; the tax savings arising from the TCJA rate reduction would be retained
FPU Electric (Florida PSC) |  | $5,995 | In January 2019, PSC approved amortization of ADIT through purchased power cost recovery, storm reserve and rates. |  | TCJA benefit will flow back to its customers through a combination of reductions to the fuel cost recovery rate, base rates, as well as application to the storm reserve over the next several years

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