Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 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 tables:

	Pension						Postretirement
	Three Months Ended June 30,						Three Months Ended June 30,
	2012			2011			2012		2011
Components of Net Periodic Benefit Cost
Service cost	$	2,102		$	1,695		$	227	$	182
Interest cost	4,321			4,522			242		236
Expected return on plan assets	(6,369		)	(6,455		)	—		—
Amortization of prior service cost	327			340			6		22
Amortization of losses	4,394			2,593			156		66
Net periodic benefit cost	$	4,775		$	2,695		$	631	$	506

	Pension						Postretirement
	Six Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012		2011
Components of Net Periodic Benefit Cost
Service cost	$	4,042		$	3,390		$	437	$	364
Interest cost	8,309			9,044			465		472
Expected return on plan assets	(12,248		)	(12,910		)	—		—
Amortization of prior service cost	629			680			12		44
Amortization of losses	8,451			5,186			299		132
Net periodic benefit cost	$	9,183		$	5,390		$	1,213	$	1,012