Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2013

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	2013			2012
Service cost	$	1,984		$	1,613
Interest cost	4,987			5,322
Expected return on plan assets	(8,276		)	(8,033		)
Amortization of prior service cost	203			211
Recognized losses	4,075			2,759
Curtailment loss	199			—
Net periodic benefit cost	$	3,172		$	1,872
	Three months ended March 31,
Other Postretirement Benefits	2013			2012
Service cost	$	77		$	77
Interest cost	543			680
Amortization of prior service credit	(395		)	(396		)
Recognized losses	290			286
Net periodic benefit cost	$	515		$	647