Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2011

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

	For the three months ended June 30,						For the six months ended June 30,
Pensions	2011			2010			2011			2010
Service cost	$	1,375		$	1,399		$	2,944		$	3,106
Interest cost	5,668			5,709			11,240			11,389
Expected return on plan assets	(8,130		)	(7,660		)	(16,030		)	(15,365		)
Amortization of prior service cost	287			239			562			459
Recognized losses	1,543			643			2,875			1,222
Net periodic benefit cost	$	743		$	330		$	1,591		$	811
	For the three months ended June 30,						For the six months ended June 30,
Other Postretirement Benefits	2011			2010			2011			2010
Service cost	$	48		$	61		$	143		$	187
Interest cost	685			796			1,424			1,632
Amortization of prior service cost	(485		)	(246		)	(771		)	(491		)
Recognized losses	240			105			404			215
Curtailment gain	—			—			—			(987		)
Net periodic benefit cost	$	488		$	716		$	1,200		$	556