Income Taxes (Summary Of A Reconciliation Of The Beginning And Ending Amount Of Gross Unrecognized Tax Benefits ("UTB")) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross UTB balance at beginning of year	$ 2,542	$ 2,461
Additions based on tax positions related to the current year	97	167
Additions for tax positions of prior years	18	14
Reductions for tax positions of prior years	(896)	(100)
Reductions due to lapse of applicable statute of limitations	0	0
Gross UTB balance at end of year	1,761	2,542
Net UTB balance at end of year	$ 160	$ 477