Goodwill and Intangible Assets Goodwill Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill Rollforward [Abstract]
Goodwill	$ 31,343	$ 36,747	$ 40,454
Goodwill, Foreign Currency Translation Gain (Loss)	$ (5,404)	$ (3,707)