Pension and Postretirement Benefits (Amounts Recognized in Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
U.S Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net loss	$ (64,970)	$ (54,391)
Unrecognized prior service cost	(1,933)	(719)
Accumulated other comprehensive loss, net of tax	(66,903)	(55,110)	(90,270)	(98,745)
Non-U.S Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net loss	(69,161)	(77,379)
Unrecognized prior service cost	(437)	(1,484)
Accumulated other comprehensive loss, net of tax	(69,598)	(78,863)	(76,197)	(43,110)
Postretirement Medical Benefits
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net loss	2,788	4,445
Unrecognized prior service cost	(1,685)	0
Accumulated other comprehensive loss, net of tax	$ 1,103	$ 4,445	$ 4,710	$ 7,081