Accumulated Other Comprehensive (Loss) Income (Schedule Of Components Of Accumulated Other Comprehensive (Loss) Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Component of Other Income, Nonoperating [Line Items]
Accumulated other comprehensive (loss) income, net of tax, Opening balance	$ (3,350)	$ (2,060)
Accumulated other comprehensive (loss) income, net of tax, Current period change	1,775	(1,290)	170
Accumulated other comprehensive (loss) income, net of tax, Closing balance	(1,575)	(3,350)	(2,060)
Foreign Currency Translation Adjustment [Member]
Component of Other Income, Nonoperating [Line Items]
Accumulated other comprehensive (loss) income, net of tax, Opening balance	(2,446)	(1,214)
Accumulated other comprehensive (loss) income, net of tax, Current period change	2,353	(1,232)
Accumulated other comprehensive (loss) income, net of tax, Closing balance	(93)	(2,446)
Retirement Benefit Liability Adjustment [Member]
Component of Other Income, Nonoperating [Line Items]
Accumulated other comprehensive (loss) income, net of tax, Opening balance	71	258
Accumulated other comprehensive (loss) income, net of tax, Current period change	(79)	(187)
Accumulated other comprehensive (loss) income, net of tax, Closing balance	(8)	71
Unamortized Post-Retirement Health Care Costs [Member]
Component of Other Income, Nonoperating [Line Items]
Accumulated other comprehensive (loss) income, net of tax, Opening balance	(975)	(1,104)
Accumulated other comprehensive (loss) income, net of tax, Current period change	(499)	129
Accumulated other comprehensive (loss) income, net of tax, Closing balance	$ (1,474)	$ (975)