Restructuring Restructuring Plan (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) employee
Restructuring Reserve
Beginning balance	$ 273
Ending balance	225	$ 273
2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of Positions Eliminated (in employee) | employee		7
Restructuring Reserve
Beginning balance	273
Costs Incurred	0	$ 286
Cash Payments	(48)
Ending balance	$ 225	$ 273