Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

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