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Acquisitions (Purchase Consideration - Cash Outflow) (Details)
$ in Thousands, CAD in Millions
5 Months Ended 6 Months Ended
Oct. 01, 2016
CAD
Oct. 01, 2016
USD ($)
Feb. 28, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Business Acquisition [Line Items]          
Net cash       $ 1,494 $ 0
Apex Acquisition[Member]          
Business Acquisition [Line Items]          
Cash consideration CAD 27.7 $ 21,100 $ 24,289    
Less: cash balances acquired     (3,060)    
Net cash     $ 21,229