Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jul. 02, 2013
Goodwill [Line Items]
Goodwill	$ 62,808	$ 62,280
Indefinite-Lived Trademarks	2,165	2,165
Goodwill [Roll Forward]
Goodwill, Balance beginning of period	99,553
Accumulated Impairment Loss	(37,949)	(37,273)
Additions	0
Translation and purchase accounting djustments	528
Goodwill, Balance end of period	100,757
GETS [Member]
Goodwill [Roll Forward]
Goodwill, Balance beginning of period	35,713
Accumulated Impairment Loss	(164)	(164)
Additions	0
Translation and purchase accounting djustments	0
Goodwill, Balance end of period	35,713
PSS [Member]
Goodwill [Line Items]
Fair value in excess of carrying value (percent)			15.00%
Goodwill			10,500
Goodwill [Roll Forward]
Goodwill, Balance beginning of period	47,075
Accumulated Impairment Loss	(30,466)	(30,057)
Additions	0
Translation and purchase accounting djustments	432
Goodwill, Balance end of period	47,916
MRI [Member]
Goodwill [Roll Forward]
Goodwill, Balance beginning of period	16,765
Accumulated Impairment Loss	(7,319)	(7,052)
Additions	0
Translation and purchase accounting djustments	96
Goodwill, Balance end of period	$ 17,128