Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2011

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

Schedule of Defined Benefit Plans Disclosures [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 June 30,						Three Months Ended June 30,
	2011			2010			2011		2010
Components of Net Periodic Benefit Cost
Service cost	$	1,695		$	1,452		$	182	$	146
Interest cost	4,522			4,291			236		257
Expected return on plan assets	(6,455		)	(5,416		)	—		—
Amortization of prior service cost	340			518			22		22
Amortization of plan amendment	—			—			—		(2,392		)
Amortization of losses	2,593			1,130			66		1,478
Net periodic benefit cost	$	2,695		$	1,975		$	506	$	(489	)

	Pension						Postretirement
	Six Months Ended June 30,						Six Months Ended June 30,
	2011			2010			2011		2010
Components of Net Periodic Benefit Cost
Service cost	$	3,390		$	3,098		$	364	$	292
Interest cost	9,044			8,870			472		514
Expected return on plan assets	(12,910		)	(10,826		)	—		—
Amortization of prior service cost	680			829			44		44
Amortization of plan amendment	—			—			—		(4,784		)
Amortization of losses	5,186			3,228			132		2,956
Net periodic benefit cost	$	5,390		$	5,199		$	1,012	$	(978	)