Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

Pension and other postretirement benefits expenses consisted of the following:

	Three months ended September 30,						Nine months ended September 30,
Pensions	2013			2012			2013			2012
Service cost	$	1,393		$	1,704		$	4,839		$	4,962
Interest cost	5,018			5,419			15,043			16,156
Expected return on plan assets	(8,273		)	(8,216		)	(24,867		)	(24,506		)
Amortization of prior service cost	185			209			567			629
Amortization of actuarial losses	4,038			3,170			12,331			9,029
Curtailment loss	—			—			199			—
Settlement loss	—			91			637			91
Special termination benefits	—			—			1,016			—
Net periodic benefit cost	$	2,361		$	2,377		$	9,765		$	6,361
	Three months ended September 30,						Nine months ended September 30,
Other Postretirement Benefits	2013			2012			2013			2012
Service cost	$	58		$	69		$	176		$	205
Interest cost	513			643			1,548			1,902
Amortization of prior service credit	(223		)	(396		)	(783		)	(1,189		)
Amortization of actuarial losses	241			269			762			811
Curtailment gain	—			—			(3,081		)	—
Net periodic benefit cost	$	589		$	585		$	(1,378	)	$	1,729