Apex Acquisition (Purchase Consideration - Cash Outflow) (Details) $ in Thousands, CAD in Millions						12 Months Ended
	Oct. 31, 2016 USD ($)	Oct. 01, 2016 CAD	Oct. 01, 2016 USD ($)	Jun. 29, 2016 CAD	Apr. 25, 2016 CAD	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Net cash - investing activities						$ 19,735	$ 0	$ 0
Apex Acquisition[Member]
Business Acquisition [Line Items]
Cash consideration	$ 24,289	CAD 27.7	$ 21,100	CAD 0.6	CAD 0.6
Less: working capital adjustments	(1,494)
Less: cash balances acquired	(3,060)
Net cash - investing activities	$ 19,735