Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2012

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	2012			2011			2012			2011
Service cost	$	1,704		$	1,477		$	4,962		$	4,421
Interest cost	5,419			5,626			16,156			16,866
Expected return on plan assets	(8,216		)	(8,030		)	(24,506		)	(24,060		)
Amortization of prior service cost	209			280			629			842
Recognized losses	3,170			1,436			9,029			4,311
Settlement loss	91			—			91			—
Net periodic benefit cost	$	2,377		$	789		$	6,361		$	2,380
	Three months ended September 30,						Nine months ended September 30,
Other Postretirement Benefits	2012			2011			2012			2011
Service cost	$	69		$	70		$	205		$	213
Interest cost	643			712			1,902			2,136
Amortization of prior service credit	(396		)	(385		)	(1,189		)	(1,156		)
Recognized losses	269			202			811			606
Net periodic benefit cost	$	585		$	599		$	1,729		$	1,799