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Pension and postretirement benefits (Table)
9 Months Ended
Sep. 30, 2015
Pension Plans, Defined Benefit [Member]  
Schedule Of Net Benefit Costs Table Text Block
Pension PlanBenefit Restoration Plans
Quarters ended September 30,Quarters ended September 30,
(In thousands)2015201420152014
Interest cost$7,403$7,461$407$415
Expected return on plan assets(11,056)(11,630)(589)(606)
Amortization of net loss4,4652,019311108
Total net periodic pension cost (benefit)$812$(2,150)$129$(83)

Pension PlansBenefit Restoration Plans
Nine months ended September 30,Nine months ended September 30,
(In thousands)2015201420152014
Interest Cost$22,209$22,383$1,222$1,244
Expected return on plan assets(33,168)(34,891)(1,768)(1,816)
Amortization of net loss13,3956,056933323
Total net periodic pension cost (benefit)$2,436$(6,452)$387$(249)
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)2015201420152014
Service cost$367$364$1,103$1,093
Interest cost1,5891,7124,7675,135
Amortization of prior service cost(950)(950)(2,850)(2,850)
Amortization of net loss249-747-
Total net periodic postretirement benefit cost$1,255$1,126$3,767$3,378