Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income (loss)	$ 5,509	$ (2,086)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(3,800)	(904)
Reclassification of loss on cash flow hedges, net of tax	143	0
Adjustment to retirement benefit liability, net of tax	2	2
Adjustment to post-retirement health care liability, net of tax	37	19
Other comprehensive loss	(3,618)	(883)
Total comprehensive income (loss)	$ 1,891	$ (2,969)