Pensions and Other Postretirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended						3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Pension Plans [Member]	Jun. 30, 2012 Pension Plans [Member]	Jun. 30, 2013 Other Postretirement Benefits [Member]	Jun. 30, 2012 Other Postretirement Benefits [Member]	Mar. 31, 2012 Sweden Pension Plans [Member]	Jun. 30, 2012 US and Canada Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost					$ 1,684	$ 1,699	$ 571	$ 536
Interest cost					4,000	7,589	1,604	1,844
Expected return on assets					(4,068)	(7,184)
Amortization of prior service cost/(credit)					17	17	(1,834)
Amortization of transition obligation					34	37		(1,834)
Amortization of net actuarial loss					1,571	2,839	1,757	1,608
Settlement		110,560		119,735		119,735			9,200	110,600
Net periodic benefit cost					$ 3,238	$ 124,732	$ 2,098	$ 2,154