Accumulated Other Comprehensive (Loss) Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income, net of tax, Opening balance	$ (1,575)	$ (3,350)
Accumulated other comprehensive (loss) income, net of tax, Current period change	(2,010)	1,775	(1,290)
Accumulated other comprehensive (loss) income, net of tax, Closing balance	(3,585)	(1,575)	(3,350)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income, net of tax, Opening balance	(93)	(2,446)
Accumulated other comprehensive (loss) income, net of tax, Current period change	(2,108)	2,353
Accumulated other comprehensive (loss) income, net of tax, Closing balance	(2,201)	(93)
Retirement Benefit Liability Adjustment [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income, net of tax, Opening balance	(8)	71
Accumulated other comprehensive (loss) income, net of tax, Current period change	53	(79)
Accumulated other comprehensive (loss) income, net of tax, Closing balance	45	(8)
Accrued Post-Retirement Health Care Costs [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income, net of tax, Opening balance	(1,474)	(975)
Accumulated other comprehensive (loss) income, net of tax, Current period change	45	(499)
Accumulated other comprehensive (loss) income, net of tax, Closing balance	$ (1,429)	$ (1,474)