Restructuring Charges and Fees, Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Professional Fees				$ (11,000)		$ (4,000)
Pre-tax restructuring charge	$ 13,000	$ 5,000	$ 9,000
Restructuring charges				3,000
Goodwill and intangible asset impairment						2,000
Proceeds from divestiture of businesses					$ 2,000
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 13,320	$ 5,074	8,830
CRSAL | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges						$ 3,000