Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2012

Pension and Other Postretirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Pension Benefits						Postretirement Benefits
	Three Months Ended September 30,						Three Months Ended September 30,
Components of Net Periodic Benefit Cost	2012			2011			2012			2011
Service cost	$	5,554		$	4,123		$	584		$	535
Interest cost	6,224			5,671			838			920
Expected return on plan assets	(5,918		)	(5,471		)	—			—
Amortization of:
Net actuarial loss	5,279			3,526			430			493
Prior service cost (gain)	346			352			(546		)	(546		)
Net periodic benefit cost	$	11,485		$	8,201		$	1,306		$	1,402
	Pension Benefits						Postretirement Benefits
	Nine Months Ended September 30,						Nine Months Ended September 30,
Components of Net Periodic Benefit Cost	2012			2011			2012			2011
Service cost	$	16,661		$	12,372		$	1,752		$	1,606
Interest cost	18,672			17,013			2,516			2,759
Expected return on plan assets	(17,753		)	(16,413		)	—			—
Amortization of:
Net actuarial loss	15,837			10,578			1,290			1,478
Prior service cost (gain)	1,036			1,054			(1,636		)	(1,636		)
Net periodic benefit cost	$	34,453		$	24,604		$	3,922		$	4,207