Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2014

Pension and Other Postretirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

The net periodic benefit cost for the three months ended March 31, 2014 and 2013 included the following components: 

	Pension Benefits						Postretirement Benefits
	Three Months Ended March 31,						Three Months Ended March 31,
Components of Net Periodic Benefit Cost	2014			2013			2014			2013
Service cost	$	5,597		$	6,525		$	625		$	675
Interest cost	6,799			5,975			825			725
Expected return on plan assets	(6,675		)	(5,975		)	—			—
Amortization of:
Net actuarial loss	4,534			6,325			275			475
Prior service cost (gain)	246			350			(550		)	(550		)
Settlement loss	789			—			—			—
Net periodic benefit cost	$	11,290		$	13,200		$	1,175		$	1,325