Other Comprehensive Loss (The Effect Of The Reclassifications From Other Comprehensive Loss To Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustments, Before Tax	$ (269)	$ (50)	$ (199)	$ (252)
Foreign currency translation adjustments, Tax	0	0	0	0
Foreign currency translation adjustments, Net of Tax	(269)	(50)	(199)	(252)
Net change related to available-for-sale securities: Unrealized gains (losses), Before Tax	1	3	129	(33)
Net change related to available-for-sale securities: Unrealized gains (losses), Tax	0	0	(26)	8
Net change related to available-for-sale securities: Unrealized gains (losses), Net of Tax	1	3	103	(25)
Reclassification included in interest income and other, Before Tax	0	(3)	0	(3)
Reclassification included in interest income and other, Tax	0	0	0	0
Reclassification included in interest income and other, Net of Tax	0	(3)	0	(3)
Net changes related to available-for-sale securities, Before Tax	1	0	129	(36)
Net changes related to available-for-sale securities, Tax	0	0	(26)	8
Net changes related to available-for-sale securities, Net of Tax	1	0	103	(28)
Other comprehensive loss before income taxes	(268)	(50)	(70)	(288)
Other comprehensive loss, Tax	0	0	(26)	8
Other comprehensive loss, net of tax	$ (268)	$ (50)	$ (96)	$ (280)