Other Comprehensive Income (Loss) (The Effect Of The Reclassifications From Other Comprehensive Income (Loss) To Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustments, Before Tax	$ 157	$ (116)	$ 587	$ 78
Foreign currency translation adjustments, Tax	(35)	0	(173)	0
Foreign currency translation adjustments, Net of Tax	122	(116)	414	78
Net change related to available-for-sale securities: Unrealized gains (losses), Before Tax	0	(36)	31	32
Net change related to available-for-sale securities: Unrealized gains (losses), Tax	0	0	(11)	0
Net change related to available-for-sale securities: Unrealized gains (losses), Net of Tax	0	(36)	20	32
Reclassification adjustment, Before Tax	0	0	0	0
Reclassification adjustment, Tax	0	0	0	0
Reclassification adjustment, Net of Tax	0	0	0	0
Total unrealized gains on available-for-sale securities	0	(36)	31	32
Total net changes related to available-for-sale securities, Tax	0	0	(11)	0
Total net changes related to available-for-sale securities, Net of Tax	0	(36)	20	32
Net changes related to foreign exchange forward contracts: Unrealized gains, Before Tax	0	0	0	53
Net changes related to foreign exchange forward contracts: Unrealized gains, Tax			0	0
Net changes related to foreign exchange forward contracts: Unrealized gains, Net of Tax			0	53
Reclassification adjustment, Before Tax	0	0	0	36
Total unrealized gains (losses) on foreign exchange forward contracts	0	0	0	89
Total net changes related to foreign exchange forward contracts, Tax			0	0
Total net changes related to foreign exchange forward contracts, Net of Tax			0	89
Other comprehensive income (loss), before tax	157	(152)	618	199
Other comprehensive income (loss), Tax	(35)	0	(184)	0
Other comprehensive income (loss), net of tax	$ 122	$ (152)	434	199
Cost of Revenues [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, Before Tax			0	27
Reclassification adjustment, Tax			0	0
Reclassification adjustment , Net of Tax			0	27
Research and Development Expense [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, Before Tax			0	6
Reclassification adjustment, Tax			0	0
Reclassification adjustment , Net of Tax			0	6
Selling, General and Administrative Expenses [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, Before Tax			0	3
Reclassification adjustment, Tax			0	0
Reclassification adjustment , Net of Tax			$ 0	$ 3