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Acquisitions (Details 1)
$ in Thousands
 9 Months Ended
Sep. 30, 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
Business Combination, Consideration Transferred $ 12,065
Payments to Acquire Businesses, Gross 10,965
Payment to Acquire Businesses, Deferred $ 1,100
Business Acquisition, Deferred Payment Term 6 months
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
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
Payment to Acquire Businesses, Deferred $ 350
Business Acquisition, Deferred Payment Term 60 days