Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2013

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	2013			2012			2013			2012
Service cost	$	6,030		$	5,554		$	661		$	584
Interest cost	5,979			6,224			718			838
Expected return on plan assets	(5,977		)	(5,918		)	—			—
Amortization of:
Net actuarial loss	6,593			5,279			449			430
Prior service cost (gain)	343			346			(545		)	(546		)
Net periodic benefit cost	$	12,968		$	11,485		$	1,283		$	1,306
	Pension Benefits						Postretirement Benefits
	Nine Months Ended September 30,						Nine Months Ended September 30,
Components of Net Periodic Benefit Cost	2013			2012			2013			2012
Service cost	$	18,089		$	16,661		$	1,983		$	1,752
Interest cost	17,936			18,672			2,154			2,516
Expected return on plan assets	(17,931		)	(17,753		)	—			—
Amortization of:
Net actuarial loss	19,778			15,837			1,346			1,290
Prior service cost (gain)	1,031			1,036			(1,635		)	(1,636		)
Net periodic benefit cost	$	38,903		$	34,453		$	3,848		$	3,922