Rates and Other Regulatory Activities Summary of Effects of Tax Reform Impact on Regulated Businesses (Tables)

12 Months Ended

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