Intangible Assets (Summary Of Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 15,485	$ 8,789
Accumulated Amortization	(3,706)	(3,244)
Customer List [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,400
Accumulated Amortization	(67)
Self-Fitting Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,975	3,679
Accumulated Amortization	(199)
Technology Access [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,110	5,110
Accumulated Amortization	$ (3,440)	$ (3,244)