Restructuring Charges and Fees, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Restructuring Reserve	$ 7,278
Workforce reduction charges	3,000
Restructuring Reserve	13,074	$ 7,278
Employee Termination Costs
Restructuring Reserve [Roll Forward]
Restructuring Reserve	7,278	12,333	$ 2,486
Workforce reduction charges	13,320	5,074	8,830
Payments for Restructuring	(7,524)	(10,129)	(2,208)
Restructuring Reserve	$ 13,074	$ 7,278	12,333
CRSAL | Employee Termination Costs
Restructuring Reserve [Roll Forward]
Workforce reduction charges			3,000
Payments for Restructuring			$ 3,225