Income Taxes (Reconciliation Of Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of year	$ 4,429	$ 4,109	$ 3,716
Increase in tax positions for prior years	201	134	0
Decrease in tax positions for prior years	0	0	(90)
Increase in tax positions for current year	236	319	483
Other decreases	(136)	(133)	0
Balance, end of year	$ 4,730	$ 4,429	$ 4,109