Pension and postretirement benefits (Tables)

6 Months Ended

Jun. 30, 2020

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Pension/Postretirement Benefit Cost

		Pension Plans				OPEB Plan
		Quarters ended June 30,				Quarters ended June 30,
(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

		Pension Plans				OPEB Plan
		Six months ended June 30,				Six months ended June 30,
(In thousands)		2020		2019		2020		2019
Personnel Cost:
Service cost	$	-	$	-	$	356	$	380
Other operating expenses:
Interest cost		11,694		14,219		2,456		2,977
Expected return on plan assets		(19,052)		(16,192)		-		-
Amortization prior service cost/(credit)		-		-		-		-
Amortization of net loss		10,440		11,752		284		-
Total net periodic pension cost	$	3,082	$	9,779	$	3,096	$	3,357

Schedule of accumulated and projected benefit obligations

	For the six months ended		For the year ending
(In thousands)	June 30, 2020		December 31, 2020
Pension Plans	$	114	$	229
OPEB Plan	$	2,585	$	6,516