Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2013

Pension and Other Postretirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Pension Benefits						Postretirement Benefits
	Three Months Ended March 31,						Three Months Ended March 31,
Components of Net Periodic Benefit Cost	2013			2012			2013			2012
Service cost	$	6,525		$	5,575		$	675		$	650
Interest cost	5,975			6,325			725			850
Expected return on plan assets	(5,975		)	(5,925		)	—			—
Amortization of:
Net actuarial loss	6,325			5,150			475			425
Prior service cost (gain)	350			350			(550		)	(525		)
Net periodic benefit cost	$	13,200		$	11,475		$	1,325		$	1,400