Pension and Other Postretirement Benefits

3 Months Ended

Mar. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Pension and Other Postretirement Benefits

Pension and Other Postretirement Benefits

Pension and other postretirement benefits expenses consisted of the following:

	Three months ended March 31,
Pensions	2015			2014
Service cost	$	1,453		$	1,255
Interest cost	4,695			5,438
Expected return on plan assets	(7,570		)	(8,570		)
Amortization of prior service cost	78			177
Amortization of actuarial losses	3,429			1,962
Curtailment loss	—			219
Special termination benefits	—			715
Net periodic benefit cost	$	2,085		$	1,196
	Three months ended March 31,
Other Postretirement Benefits	2015			2014
Service cost	$	37		$	52
Interest cost	493			559
Amortization of prior service credit	(141		)	(217		)
Amortization of actuarial losses	261			216
Curtailment loss	—			4
Net periodic benefit cost	$	650		$	614

Curtailment losses and special termination benefits during the first three months of 2014 relate to certain defined benefit pension and other postretirement benefit plans that were impacted by the closure of production operations at an Associated Spring facility located in Saline, Michigan.