Pension Plans And Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2020

Components Of Net Periodic Benefit Costs

	Pension Benefits
	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Service cost	$	763	$	680	$	1,526	$	1,360
Interest cost		2,540		2,954		5,080		5,908
Expected return on plan assets		(3,938)		(3,818)		(7,876)		(7,636)
Amortization of prior service cost		148		155		296		310
Amortization of actuarial loss		1,992		1,982		3,984		3,964
Net periodic benefit cost	$	1,505	$	1,953	$	3,010	$	3,906
	Other
	Postretirement Benefits
		Three Months Ended				Six Months Ended
		June 30,				June 30,
	2020		2019		2020		2019
Service cost	$	217	$	205	$	434	$	410
Interest cost		677		750		1,354		1,500
Expected return on plan assets		(675)		(621)		(1,350)		(1,242)
Amortization of prior service credit		(116)		(116)		(232)		(232)
Amortization of actuarial loss		156		166		312		332
Net periodic benefit cost	$	259	$	384	$	518	$	768

Peoples Gas Acquisition [Member]

Components Of Net Periodic Benefit Costs

	Three Months Ended				Six Months Ended
	June 30, 2020				June 30, 2020
	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
Service cost	$	226	$	441	$	266	$	518
Interest cost		1,090		309		1,281		363
Expected return on plan assets		(1,719)		(432)		(2,021)		(507)
Net periodic benefit (income) cost	$	(403)	$	318	$	(474)	$	374