Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2012

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

The net pension and postretirement benefit costs that have been recognized during the stated periods are shown in the following table:

	Pension						Postretirement
	Three Months Ended March 31,						Three Months Ended March 31,
	2012			2011			2012		2011
Components of Net Periodic Benefit Cost
Service cost	$	1,940		$	1,695		$	210	$	182
Interest cost	3,989			4,522			223		236
Expected return on plan assets	(5,879		)	(6,455		)	—		—
Amortization of prior service cost	302			340			6		22
Amortization of losses	4,056			2,593			144		66
Net periodic benefit cost	$	4,408		$	2,695		$	583	$	506