Pension and postretirement benefits (Tables)

6 Months Ended

Jun. 30, 2017

Pension Plans, Defined Benefit [Member]

Schedule Of Net Benefit Costs Table Text Block

		Pension Plan				Benefit Restoration Plans
		Quarters ended June 30,				Quarters ended June 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		4,880		411		332
Total net periodic pension cost (benefit)	$	987	$	1,548	$	261	$	142

		Pension Plans				Benefit Restoration Plans
		Six months ended June 30,				Six months ended June 30,
(In thousands)		2017		2016		2017		2016
Interest Cost	$	12,240	$	12,583	$	705	$	696
Expected return on plan assets		(20,372)		(19,246)		(1,005)		(1,076)
Amortization of net loss		10,107		9,760		822		663
Total net periodic pension cost (benefit)	$	1,975	$	3,097	$	522	$	283

Other Postretirement Benefit Plans Defined Benefit [Member]

Schedule Of Net Benefit Costs Table Text Block

		Postretirement Benefit Plan
		Quarters ended June 30,				Six months ended June 30,
(In thousands)		2017		2016		2017		2016
Service cost	$	256	$	289	$	513	$	578
Interest cost		1,426		1,505		2,851		3,010
Amortization of prior service cost		(950)		(950)		(1,900)		(1,900)
Amortization of net loss		142		275		284		550
Total net periodic postretirement benefit cost	$	874	$	1,119	$	1,748	$	2,238