Basis of Presentation and Significant Accounting Policies - Foreign Currency Translation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated translation losses	$ 16,300	$ 19,500
Foreign currency exchange gains (losses)	$ 109	$ (1,650)	$ (1,974)