Goodwill and Other Intangible Assets - Goodwill Activity (Details) - USD ($) $ in Thousands			12 Months Ended
	Oct. 01, 2016	Oct. 01, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill Activity
Beginning balance			$ 73,123	$ 73,801
Currency translation			(1,127)	(678)
Ending balance			71,996	73,123	$ 73,801
Impairment of goodwill	$ 0	$ 0	$ 0	$ 0	$ 0