Acquisitions (Details 1) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
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	$ 11,843
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	$ 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
Payment to Acquire Businesses, Deferred	$ 350
Business Acquisition, Transaction Costs		$ 191