Commitments And Contingencies (Narrative) (Details) $ in Thousands	1 Months Ended		3 Months Ended
	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CAD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Preliminary tax assessment			$ 923,000	$ 1,218
U.S. Employee [Member]
Loss Contingencies [Line Items]
Accrual related to settlement					$ 300,000	$ 200,000
Trade Secrets Case [Member]
Loss Contingencies [Line Items]
Judgment awarded		$ 675,000
Accrual related to settlement							$ 675,000
Net payments due to settlement with defendants	$ 66,000