Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Opening Balance	$ (4,863)
Other Comprehensive Income (Loss) before Reclassifications	1,909
Reclassification from Accumulated Other Comprehensive Income	310	191	119
Other Comprehensive Income (Loss), Net of Tax	2,219	859	(1,826)
Closing Balance	(2,644)	(4,863)
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Opening Balance	(290)
Other Comprehensive Income (Loss) before Reclassifications	1,573
Reclassification from Accumulated Other Comprehensive Income	0
Other Comprehensive Income (Loss), Net of Tax	1,573
Closing Balance	1,283
Derivatives qualifying as hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Opening Balance	0
Other Comprehensive Income (Loss) before Reclassifications	(116)
Reclassification from Accumulated Other Comprehensive Income	67
Other Comprehensive Income (Loss), Net of Tax	(49)
Closing Balance	(49)
Defined benefit pension plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Opening Balance	(4,573)
Other Comprehensive Income (Loss) before Reclassifications	452
Reclassification from Accumulated Other Comprehensive Income	243
Other Comprehensive Income (Loss), Net of Tax	695
Closing Balance	$ (3,878)