Restructuring - Narrative (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017 USD ($) employee	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) employee	Jun. 30, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,079		$ 0	$ 1,805	$ 0
Arizona
Restructuring Cost and Reserve [Line Items]
Number of employees | employee	70			70
Restructuring charges		$ 1,100		$ 1,800
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 100			320
Expected cost to be paid	$ 1,200			$ 1,200