Restructuring Restructuring Plan (Details Textual) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) employee	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) employee
Restructuring charges	$ 286	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 286	$ 0	$ 391
Restructuring Costs in Discontinued Operations									$ 1,400
2016 Restructuring Plan [Member]
Number of Positions Eliminated (in employee) | employee									7
Restructuring charges									$ 300
2014 Restructuring Plan [Member]
Number of Positions Eliminated (in employee) | employee											44
Restructuring charges										$ 0	$ 1,841
Restructuring Costs in Discontinued Operations											$ 1,400