Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income (loss)	$ 9,540	$ (13,727)	$ 13,885	$ (9,642)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(2,734)	2,539	(2,096)	(1,362)
Net change in unrealized gain (loss) on cash flow hedges, net of tax	714	0	(242)	0
Adjustment to retirement benefit liability, net of tax	2	3	6	7
Adjustment to post-retirement health care liability, net of tax	19	18	56	56
Other comprehensive (loss) income	(1,999)	2,560	(2,276)	(1,299)
Total comprehensive income (loss)	$ 7,541	$ (11,167)	$ 11,609	$ (10,941)