Pension and Other Postretirement Benefits (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Employee benefit obligations:
Employee benefit obligations (noncurrent)	$ (96,100)	$ (75,257)
U.S. Pension Benefits [Member]
Employee benefit obligations:
Accrued payrolls and employee benefits (current)	(25)	(53)
Employee benefit obligations (noncurrent)	(56,814)	(41,358)
Employee benefit obligations current and non current	(56,839)	(41,411)
Foreign Pension Benefits [Member]
Employee benefit obligations:
Accrued payrolls and employee benefits (current)	(152)	(1,905)
Employee benefit obligations (noncurrent)	(17,183)	(12,357)
Employee benefit obligations current and non current	(17,335)	(14,262)
Other Postretirement Benefits [Member]
Employee benefit obligations:
Accrued payrolls and employee benefits (current)	(738)	(881)
Employee benefit obligations (noncurrent)	(22,068)	(21,467)
Employee benefit obligations current and non current	$ (22,806)	$ (22,348)