Restructuring - Schedule of Restructuring Accruals Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Beginning balance	$ 4,180	$ 3,893
Restructuring expenses	12,083	8,455	$ 3,674
Payments, utilization and other	(10,093)	(8,168)
Ending balance	$ 6,170	$ 4,180	$ 3,893