Employee Benefit Plans (Tables)

9 Months Ended

Sep. 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 September 30,						Three Months Ended September 30,
	2011			2010			2011		2010
Components of Net Periodic Benefit Cost
Service cost	$	1,695		$	1,549		$	99	$	148
Interest cost	4,522			4,435			257		258
Expected return on plan assets	(6,455		)	(5,412		)	—		—
Amortization of prior service cost	340			414			49		21
Amortization of plan amendment	—			—			—		(637		)
Amortization of losses	2,593			1,614			296		459
Net periodic benefit cost	$	2,695		$	2,600		$	701	$	249

	Pension						Postretirement
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2011			2010			2011		2010
Components of Net Periodic Benefit Cost
Service cost	$	5,086		$	4,647		$	463	$	440
Interest cost	13,566			13,305			729		772
Expected return on plan assets	(19,366		)	(16,238		)	—		—
Amortization of prior service cost	1,020			1,243			93		65
Amortization of plan amendment	—			—			—		(5,421		)
Amortization of losses	7,779			4,842			428		3,415
Net periodic benefit cost	$	8,085		$	7,799		$	1,713	$	(729	)