Restructuring and Other Charges, Net - Activities of Restructuring Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 13,074
Workforce reduction charges	(4,000)	$ (3,000)
Restructuring reserve, ending balance	7,595	13,074
Employee Termination Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	13,074	7,278	$ 12,333
Workforce reduction charges	8,366	13,320	5,074
Utilization	(13,845)	(7,524)	(10,129)
Restructuring reserve, ending balance	$ 7,595	$ 13,074	$ 7,278