Pensions and Other Benefits (Details 1) (Postretirement benefit plans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Postretirement benefit plans [Member]
Net periodic benefit expense
Interest cost	$ 24	$ 13	$ 48	$ 26
Amortization of prior service credit	(157)	(156)	(313)	(313)
Recognized net actuarial loss	97	61	195	122
Net periodic benefit expense	(36)	(82)	(70)	(165)
Summary of the net actuarial loss and prior service credit
Net actuarial loss	97	61	195	122
Tax benefit on net actuarial loss	(37)	(24)	(74)	(47)
Prior service costs	(157)	(156)	(313)	(313)
Tax (benefit) expense on prior service costs	60	59	119	119
Net amortization from accumulated other comprehensive income	$ (37)	$ (60)	$ (73)	$ (119)