Pension and postretirement benefits (Tables)

3 Months Ended

Mar. 31, 2020

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Pension/Postretirement Benefit Cost

		Pension Plans				OPEB Plan
		Quarters ended March 31,				Quarters ended March 31,
(In thousands)		2020		2019		2020		2019
Personnel Cost:
Service cost	$	-	$	-	$	178	$	190
Other operating expenses:
Interest cost		5,847		7,110		1,228		1,489
Expected return on plan assets		(9,526)		(8,096)		-		-
Amortization of prior service cost/(credit)		-		-		-		-
Amortization of net loss		5,220		5,876		142		-
Total net periodic pension cost	$	1,541	$	4,890	$	1,548	$	1,679

Schedule of accumulated and projected benefit obligations

	For the quarter ended		For the year ending
(In thousands)	March 31, 2020		December 31, 2020
Pension Plans	$	57	$	229
OPEB Plan	$	1,213	$	6,516