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Acquisitions (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
entity
Sep. 30, 2014
USD ($)
Business Acquisition [Line Items]    
Acquisition of a business, net of cash acquired $ 8,200 $ 7,516
Payments to acquire businesses $ 7,500  
Number of businesses acquired | entity 2  
Contingent consideration $ 3,200  
Acquired goodwill 5,000  
Working capital 1,100  
Fixed assets 300  
Deferred tax liability 900  
Customer Lists [Member]    
Business Acquisition [Line Items]    
Intangibles acquired as result of business combination $ 5,200  
Useful life assigned to intangible asset, years 15 years