Pension Plans And Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2020

Components Of Net Periodic Benefit Costs

	Pension Benefits
	Three Months Ended
	March 31,
	2020		2019
Service cost	$	763	$	680
Interest cost		2,540		2,954
Expected return on plan assets		(3,938)		(3,818)
Amortization of prior service cost		148		155
Amortization of actuarial loss		1,992		1,982
Net periodic benefit cost	$	1,505	$	1,953
	Other
	Postretirement Benefits
		Three Months Ended
		March 31,
	2020		2019
Service cost	$	217	$	205
Interest cost		677		750
Expected return on plan assets		(675)		(621)
Amortization of prior service credit		(116)		(116)
Amortization of actuarial loss		156		166
Net periodic benefit cost	$	259	$	384

Peoples Gas Acquisition [Member]

Components Of Net Periodic Benefit Costs

	Three Months Ended
	March 31, 2020
	Pension Benefits		Other Postretirement Benefits
Service cost	$	40	$	77
Interest cost		192		54
Expected return on plan assets		(302)		(76)
Net periodic benefit (income) cost	$	(70)	$	55