Pension and postretirement benefits (Tables)

9 Months Ended

Sep. 30, 2019

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Pension/Postretirement Benefit Cost

		Pension Plans				OPEB Plan
		Quarters ended September 30,				Quarters ended September 30,
(In thousands)		2019		2018		2019		2018
Personnel Cost:
Service cost	$	-	$	-	$	190	$	257
Other operating expenses:
Interest cost		7,109		6,373		1,489		1,390
Expected return on plan assets		(8,096)		(10,060)		-		-
Amortization of prior service cost/(credit)		-		-		-		(868)
Amortization of net loss		5,877		5,065		-		321
Total net periodic pension cost	$	4,890	$	1,378	$	1,679	$	1,100

		Pension Plans				OPEB Plan
		Nine months ended September 30,				Nine months ended September 30,
(In thousands)		2019		2018		2019		2018
Personnel Cost:
Service cost	$	-	$	-	$	570	$	771
Other operating expenses:
Interest cost		21,329		19,119		4,466		4,171
Expected return on plan assets		(24,288)		(30,180)		-		-
Amortization prior service cost/(credit)		-		-		-		(2,603)
Amortization of net loss		17,629		15,195		-		962
Total net periodic pension cost	$	14,670	$	4,134	$	5,036	$	3,301

Schedule of accumulated and projected benefit obligations

	For the quarters ended		For the year ending
(In thousands)	30-Sep-19		31-Dec-19
Pension Plans	$	20,057	$	20,229
OPEB Plan	$	1,472	$	8,128