Acquisitions (Details 1) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
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	$ 11,804
Payments to Acquire Businesses, Gross	10,965
Payments to Acquire Businesses, Deferred	$ 839
Business Acquisition, Number of Deferred Payments	2
Business Acquisition, Deferred Payment Term	7 months
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	$ 5,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	3,448
Business Combination, Consideration Transferred, Net	1,552
Payments to Acquire Businesses, Gross	1,202
Business Acquisition, Transaction Costs	191
Payments to Acquire Businesses, Deferred	$ 350