Pension and Other Postretirement Benefits (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ (41,355)	$ (5,517)	$ 11,748
Defined benefit pension plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(73)
Net loss	(44,289)
Amortization of prior service costs (credits)	727
Amortization of actuarial loss	4,298
Foreign exchange rate changes	531
Divestiture	8
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(38,798)
Other postretirement benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	1,475
Net loss	(3,574)
Amortization of prior service costs (credits)	(957)
Amortization of actuarial loss	498
Foreign exchange rate changes	1
Divestiture	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ (2,557)