Employee Benefit Plans (Tables)

9 Months Ended

Sep. 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 September 30,						Three Months Ended September 30,
	2012			2011			2012		2011
Components of Net Periodic Benefit Cost
Service cost	$	2,102		$	1,695		$	227	$	99
Interest cost	4,321			4,522			242		257
Expected return on plan assets	(6,369		)	(6,455		)	—		—
Amortization of prior service cost	327			340			6		49
Amortization of losses	4,394			2,593			156		296
Net periodic benefit cost	$	4,775		$	2,695		$	631	$	701

	Pension						Postretirement
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012		2011
Components of Net Periodic Benefit Cost
Service cost	$	6,143		$	5,086		$	664	$	463
Interest cost	12,630			13,566			706		729
Expected return on plan assets	(18,618		)	(19,366		)	—		—
Amortization of prior service cost	956			1,020			18		93
Amortization of losses	12,846			7,779			455		428
Net periodic benefit cost	$	13,957		$	8,085		$	1,843	$	1,713