Pension and postretirement benefits (Tables)

9 Months Ended

Sep. 30, 2017

Pension Plans, Defined Benefit [Member]

Schedule Of Net Benefit Costs Table Text Block

		Pension Plan				Benefit Restoration Plans
		Quarters ended September 30,				Quarters ended September 30,
(In thousands)		2017		2016		2017		2016
Interest cost	$	6,120	$	6,291	$	352	$	348
Expected return on plan assets		(10,186)		(9,623)		(502)		(538)
Amortization of net loss		5,053		4,881		411		332
Total net periodic pension cost (benefit)	$	987	$	1,549	$	261	$	142

		Pension Plans				Benefit Restoration Plans
		Nine months ended September 30,				Nine months ended September 30,
(In thousands)		2017		2016		2017		2016
Interest Cost	$	18,359	$	18,873	$	1,057	$	1,044
Expected return on plan assets		(30,557)		(28,869)		(1,508)		(1,614)
Amortization of net loss		15,160		14,640		1,233		996
Total net periodic pension cost (benefit)	$	2,962	$	4,644	$	782	$	426

Other Postretirement Benefit Plans Defined Benefit [Member]

Schedule Of Net Benefit Costs Table Text Block

		Postretirement Benefit Plan
		Quarters ended September 30,				Nine months ended September 30,
(In thousands)		2017		2016		2017		2016
Service cost	$	256	$	289	$	769	$	867
Interest cost		1,426		1,505		4,277		4,515
Amortization of prior service cost		(950)		(950)		(2,850)		(2,850)
Amortization of net loss		142		275		426		825
Total net periodic postretirement benefit cost	$	874	$	1,119	$	2,622	$	3,357