Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Chesapeake Pension Plan						FPU Pension Plan						Chesapeake SERP				Chesapeake Postretirement Plan						FPU Medical Plan
For the Three Months Ended September 30,	2016			2015			2016			2015			2016		2015		2016			2015			2016		2015
(in thousands)
Interest cost	$	105		$	102		$	635		$	626		$	23	$	23	$	11		$	11		$	14	$	15
Expected return on plan assets	(131		)	(135		)	(625		)	(777		)	—		—		—			—			—		—
Amortization of prior service cost	—			—			—			—			—		2		(20		)	(19		)	—		—
Amortization of net loss	103			91			133			114			22		25		16			17			—		2
Net periodic cost (benefit)	77			58			143			(37		)	45		50		7			9			14		17
Amortization of pre-merger regulatory asset	—			—			191			191			—		—		—			—			2		2
Total periodic cost	$	77		$	58		$	334		$	154		$	45	$	50	$	7		$	9		$	16	$	19

	Chesapeake Pension Plan						FPU Pension Plan						Chesapeake SERP				Chesapeake Postretirement Plan						FPU Medical Plan
For the Nine Months Ended September 30,	2016			2015			2016			2015			2016		2015		2016			2015			2016		2015
(in thousands)
Interest cost	$	315		$	306		$	1,894		$	1,877		$	68	$	68	$	32		$	33		$	41	$	45
Expected return on plan assets	(392		)	(405		)	(2,027		)	(2,330		)	—		—		—			—			—		—
Amortization of prior service cost	—			—			—			—			—		8		(60		)	(58		)	—		—
Amortization of net loss	309			272			389			341			66		74		51			53			—		5
Net periodic cost (benefit)	232			173			256			(112		)	134		150		23			28			41		50
Amortization of pre-merger regulatory asset	—			—			571			571			—		—		—			—			6		6
Total periodic cost	$	232		$	173		$	827		$	459		$	134	$	150	$	23		$	28		$	47	$	56

Amounts Included in Regulatory asset and AOCI [Table Text Block]

For the Three Months Ended September 30, 2016	Chesapeake Pension Plan		FPU Pension Plan		Chesapeake SERP		Chesapeake Postretirement Plan			FPU Medical Plan		Total
(in thousands)
Prior service credit	$	—	$	—	$	—	$	(20	)	$	—	$	(20	)
Net loss	103		133		22		16			—		274
Total recognized in net periodic benefit cost	$	103	$	133	$	22	$	(4	)	$	—	$	254
Recognized from accumulated other comprehensive loss (1)	$	103	$	25	$	22	$	(4	)	$	—	$	146
Recognized from regulatory asset	—		108		—		—			—		108
Total	$	103	$	133	$	22	$	(4	)	$	—	$	254

For the Three Months Ended September 30, 2015	Chesapeake Pension Plan		FPU Pension Plan		Chesapeake SERP		Chesapeake Postretirement Plan			FPU Medical Plan		Total
(in thousands)
Prior service cost (credit)	$	—	$	—	$	2	$	(19	)	$	—	$	(17	)
Net loss	91		114		25		17			2		249
Total recognized in net periodic benefit cost	$	91	$	114	$	27	$	(2	)	$	2	$	232
Recognized from accumulated other comprehensive loss (1)	$	91	$	22	$	27	$	(2	)	$	—	$	138
Recognized from regulatory asset	—		92		—		—			2		94
Total	$	91	$	114	$	27	$	(2	)	$	2	$	232

The following tables present the amounts included in the regulatory asset and accumulated other comprehensive loss that were recognized as components of net periodic benefit cost during the nine months ended September 30, 2016 and 2015:

For the Nine Months Ended September 30, 2016	Chesapeake Pension Plan		FPU Pension Plan		Chesapeake SERP		Chesapeake Postretirement Plan			FPU Medical Plan		Total
(in thousands)
Prior service credit	$	—	$	—	$	—	$	(60	)	$	—	$	(60	)
Net loss	309		389		66		51			—		$	815
Total recognized in net periodic benefit cost	$	309	$	389	$	66	$	(9	)	$	—	$	755
Recognized from accumulated other comprehensive loss (1)	$	309	$	74	$	66	$	(9	)	$	—	$	440
Recognized from regulatory asset	—		315		—		—			—		315
Total	$	309	$	389	$	66	$	(9	)	$	—	$	755

For the Nine Months Ended September 30, 2015	Chesapeake Pension Plan		FPU Pension Plan		Chesapeake SERP		Chesapeake Postretirement Plan			FPU Medical Plan		Total
(in thousands)
Prior service cost (credit)	$	—	$	—	$	8	$	(58	)	$	—	$	(50	)
Net loss	272		341		74		53			5		745
Total recognized in net periodic benefit cost	$	272	$	341	$	82	$	(5	)	$	5	$	695
Recognized from accumulated other comprehensive loss (1)	$	272	$	65	$	82	$	(5	)	$	1	$	415
Recognized from regulatory asset	—		276		—		—			4		280
Total	$	272	$	341	$	82	$	(5	)	$	5	$	695