Pensions and Other Postretirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Settlement		$ 9,175
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	842	849
Interest cost	2,000	4,602
Expected return on assets	(2,034)	(4,168)
Amortization of prior service cost/(credit)	9	9
Amortization of transition obligation	17	19
Amortization of net actuarial loss	785	1,773
Settlement		9,175
Net periodic benefit costs	1,619	12,259
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	285	268
Interest cost	802	922
Expected return on assets
Amortization of prior service cost/(credit)	(917)	(917)
Amortization of transition obligation
Amortization of net actuarial loss	879	804
Settlement
Net periodic benefit costs	1,049	1,077
Sweden Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement		$ 9,200