Pensions and Other Postretirement Benefit Plans (Schedule of Other Changes Recognized in Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Total recognized in other comprehensive income	$ 22,900	$ 16,588	$ 30,758
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlements	(327)
Exchange rate effect/Currency impact	(1,204)
Current year actuarial loss	39,713
Asset loss (gain)	(18,355)
Amortization of actuarial (loss)	(5,672)
Amortization of prior service (cost)/credit	(37)
Amortization of transition (obligation)	(83)
Total recognized in other comprehensive income	14,035
Total recognized in net periodic benefit cost and other comprehensive income	27,604
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlements
Exchange rate effect/Currency impact	(3)
Current year actuarial loss	6,977
Asset loss (gain)
Amortization of actuarial (loss)	(3,022)
Amortization of prior service (cost)/credit	3,666
Amortization of transition (obligation)
Total recognized in other comprehensive income	7,618
Total recognized in net periodic benefit cost and other comprehensive income	$ 12,719