Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 36,879	$ 21,947	$ 28,251
Foreign currency translation adjustment:
Unrealized foreign currency translation adjustment (net of tax benefit of $2,396 in 2014, tax of $233 in 2013 and tax of $897 in 2012)	(28,065)	(19,336)	(11,562)
Derivative financial instruments adjustment	(109)	(228)	1,399
Pension & other post-retirement benefit adjustments
Net gains (losses) and prior service costs (net of tax benefit of $22,445 in 2014, tax of $13,231 in 2013 and tax benefit of $11,145 in 2012)	(38,730)	22,203	(19,285)
Amortization of prior service costs and net gains or losses (net of tax of $3,582 in 2014, tax of $5,398 in 2013 and tax of $3,749 in 2012)	6,997	9,420	6,486
Other comprehensive income (loss)	(59,907)	12,059	(22,962)
Comprehensive income (loss)	$ (23,028)	$ 34,006	$ 5,289