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Acquisitions (Purchase Consideration - Cash Outflow) (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Net cash   $ 1,494 $ 19,735 $ 0
Apex Acquisition[Member]        
Business Acquisition [Line Items]        
Cash consideration $ 24,289      
Less: cash balances acquired (3,060)      
Net cash $ 21,229