Available-For-Sale Marketable Securities (Contractual Maturities Of The Available-For-Sale Marketable Securities) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Available-for-sale Securities [Abstract]
2015	$ 374
2016	1,568
2017	2,405
2018	2,564
2019 and after	6,218
Total contractual maturities of the available for sale securities	$ 13,129

Available-For-Sale Securities, Debt Maturities, After Year Five, Fair Value

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Available-For-Sale Securities, Debt Maturities, Year Five, Fair Value

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Available-For-Sale Securities, Debt Maturities, Year Four, Fair Value

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Available-For-Sale Securities, Debt Maturities, Year Three, Fair Value

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Available-for-sale Securities, Debt Maturities, Year Two, Fair Value

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Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-Subparagraph (b)-(g)
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803

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