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Transactions - Vestica (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 01, 2016
Mar. 31, 2017
Mar. 31, 2016
Business Acquisition [Line Items]      
Cash   $ 0 $ 11,500
Vestica      
Business Acquisition [Line Items]      
Cash $ 7,500    
Contingent consideration, liability 4,000    
Vestica | Customer relationships      
Business Acquisition [Line Items]      
Total consideration $ 7,500    
Useful life 13 years