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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Aggregate fair value | [1] | $ 24,046 | $ 32,793
Gross unrealized holding gains |  |  |
Gross unrealized holding (losses) |  | (159) | (345)
Amortized cost basis | [2] | 24,205 | 33,138
Accrued interest on securities |  | 173 | 256
Current [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Aggregate fair value | [1] | 16,293 | 8,630
Gross unrealized holding gains |  |  |
Gross unrealized holding (losses) |  | (97) | (90)
Amortized cost basis | [2] | 16,390 | 8,720
Non Current [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Aggregate fair value | [1] | 7,753 | 24,163
Gross unrealized holding gains |  |  |
Gross unrealized holding (losses) |  | (62) | (255)
Amortized cost basis | [2] | $ 7,815 | $ 24,418
[1] | Fair value is being determined using quoted market prices in active markets (Level 1).
[2] | Including accrued interest in the amount of US$ 256 thousand and US$ 173 thousand as of December 31, 2015 and 2016 respectively. The accrued interest is presented as part of other account receivable on the balance sheet.

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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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