Commitments And Contingencies (Narrative) (Details) $ in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CAD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Preliminary tax assessment		$ 923	$ 1,218
Trade Secrets Case [Member]
Loss Contingencies [Line Items]
Judgment awarded	$ 675
Accrual related to settlement				$ 675