Purchased Intangible Assets and Goodwill (Changes in Purchased Intangibles Balances) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Intangible Assets [Roll Forward]
Beginning balance	$ 16,364	$ 17,771
Amortization	(1,039)	(1,039)	$ (1,100)
Foreign currency impact	(100)	(368)
Ending balance	$ 15,225	$ 16,364	$ 17,771