Acquisitions (Details 1) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Apr. 06, 2017 USD ($)
IPC Group
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Apr. 06, 2017
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Business Acquisition, Name of Acquired Entity	IP Cleaning S.p.A. and its subsidiaries ("IPC Group")
Business Combination, Consideration Transferred	$ 353,769
Cash Acquired from Acquisition	$ 8,804
Debt Instrument, Face Amount			$ 420,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			$ 115,946
Crawford Laboratories, Inc.
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Jul. 28, 2016
Business Acquisition, Name of Acquired Entity	Crawford Laboratories, Inc. and affiliates thereof ("Sellers")
Business Combination, Consideration Transferred	$ 11,843
Payments to Acquire Businesses, Gross		$ 10,965
Payment to Acquire Businesses, Deferred	$ 878
Business Acquisition, Number of Deferred Payments	2
Business Acquisition, Amount of first deferred payment		575
Dofesa Barrido Mecanizado
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Sep. 01, 2016
Business Acquisition, Name of Acquired Entity	Dofesa Barrido Mecanizado ("Dofesa")
Business Combination, Consideration Transferred	$ 4,650
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	3,448
Business Combination, Consideration Transferred, Net	$ 1,202
Business Acquisition, Transaction Costs		$ 191