Comprehensive Income (Loss) (The Effect of the Reclassifications from Comprehensive Income (Loss) to Earnings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustments, Before Tax	$ 738	$ (383)	$ (625)
Foreign currency translation adjustments, Tax	(204)	0	0
Foreign currency translation adjustments, Net of Tax	534	(383)	(625)
Net change related to available-for-sale securities: Unrealized gains (losses), Before Tax	(3)	(8)	(78)
Net change related to available-for-sale securities: Unrealized gains (losses), Tax	0	7	0
Net change related to available-for-sale securities: Unrealized gains (losses), Net of Tax	(3)	(1)	(78)
Reclassification adjustment for losses included in interest income and other, Before Tax	0	0	0
Reclassification adjustment for losses included in interest income and other, Tax	0	6	0
Reclassification adjustment for losses included in interest income and other, Net of Tax	0	6	0
Total unrealized losses on available-for-sale securities	(3)	(8)	(78)
Total net changes related to available-for-sale securities, Tax	0	13	0
Total net changes related to available-for-sale securities, Net of Tax	(3)	5	(78)
Net changes related to foreign exchange forward contracts: Unrealized gains (losses), Before Tax	0	53	(298)
Net changes related to foreign exchange forward contracts: Unrealized gains (losses), Tax	0	0	0
Net changes related to foreign exchange forward contracts: Unrealized gains (losses), Net of Tax	0	53	(298)
Reclassification adjustment for losses included in net income (loss), Before Tax	0	36	563
Total unrealized gains on foreign exchange forward contracts	0	89	265
Total net changes related to foreign exchange forward contracts, Tax	0	58	0
Total net changes related to foreign exchange forward contracts, Net of Tax	0	147	265
Other comprehensive income (loss), before tax	735	(302)	(438)
Other comprehensive income (loss), Tax	(204)	71	0
Other comprehensive income (loss), net of tax	531	(231)	(438)
Cost of Revenues [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for losses included in net income (loss), Before Tax	0	27	352
Reclassification adjustment for losses included in net income (loss), Tax	0	41	0
Reclassification adjustment for losses included in net income (loss), Net of Tax	0	68	352
Research and Development Expense [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for losses included in net income (loss), Before Tax	0	6	118
Reclassification adjustment for losses included in net income (loss), Tax	0	10	0
Reclassification adjustment for losses included in net income (loss), Net of Tax	0	16	118
Selling, General and Administrative Expenses [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for losses included in net income (loss), Before Tax	0	3	93
Reclassification adjustment for losses included in net income (loss), Tax	0	7	0
Reclassification adjustment for losses included in net income (loss), Net of Tax	$ 0	$ 10	$ 93