Pension and postretirement benefits (Tables)

3 Months Ended

Mar. 31, 2016

Pension Plans, Defined Benefit [Member]

Schedule Of Net Benefit Costs Table Text Block

		Pension Plan				Benefit Restoration Plans
		Quarters ended March 31,				Quarters ended March 31,
(In thousands)		2016		2015		2016		2015
Interest cost	$	6,291	$	7,403	$	348	$	407
Expected return on plan assets		(9,623)		(11,056)		(538)		(589)
Amortization of net loss		4,880		4,465		331		311
Total net periodic pension cost (benefit)	$	1,548	$	812	$	141	$	129

Other Postretirement Benefit Plans Defined Benefit [Member]

Schedule Of Net Benefit Costs Table Text Block

		Quarters ended March 31,
(In thousands)		2016		2015
Service cost	$	289	$	368
Interest cost		1,505		1,589
Amortization of prior service cost		(950)		(950)
Amortization of net loss		275		249
Total postretirement cost	$	1,119	$	1,256