Restructuring - Components of Restructuring Charge Payments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Reserve [Roll Forward]
Restructuring balance at December 31, 2016			$ 0
Costs incurred	$ 56	$ 0	2,541	$ 0
Cash paid			(2,651)
Other adjustments			282
Restructuring balance at September 30, 2017	$ 172		$ 172