Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (343)	$ 12,705	$ 856	$ 13,937
Adjustments for changes in:
Foreign currency translation	(4,066)	4,285	(1,945)	97
Unrecognized employee benefit costs (including effects of foreign currency translation)	1,056	(1,352)	5,137	86
Unrealized holding (losses) gains on marketable securities	(66)	103	113	296
Fair value of cash flow hedges	(72)	152	(180)	(277)
Reclassification adjustments for items included in net income:
Amortization of unrecognized employee benefit costs	827	1,458	2,612	4,245
Realized (gains) from sale of marketable securities	(24)	(17)	(59)	(51)
Realized (gains) losses from settlement of cash flow hedges	(13)	144	55	206
Other comprehensive (loss) income	(2,358)	4,773	5,733	4,602
Comprehensive (loss) income	$ (2,701)	$ 17,478	$ 6,589	$ 18,539