Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2016

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	2016			2015
Service cost	$	1,384		$	1,453
Interest cost	4,836			4,695
Expected return on plan assets	(7,543		)	(7,570		)
Amortization of prior service cost	50			78
Amortization of actuarial losses	2,556			3,429
Net periodic benefit cost	$	1,283		$	2,085

	Three months ended March 31,
Other Postretirement Benefits	2016			2015
Service cost	$	34		$	37
Interest cost	453			493
Amortization of prior service credit	(93		)	(141		)
Amortization of actuarial losses	176			261
Net periodic benefit cost	$	570		$	650