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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized cost basis | [1] | $ 33,138 | $ 35,864
Gross unrealized holding gains |  |  |
Gross unrealized holding (losses) |  | $ (345) | $ (340)
Aggregate fair value | [2] | 32,793 | 35,524
Accrued interest on securities |  | 256 | 339
Current [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized cost basis | [1] | $ 8,720 | $ 15,328
Gross unrealized holding gains |  |  |
Gross unrealized holding (losses) |  | $ (90) | $ (69)
Aggregate fair value | [2] | 8,630 | 15,259
Non Current [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized cost basis | [1] | $ 24,418 | $ 20,536
Gross unrealized holding gains |  |  |
Gross unrealized holding (losses) |  | $ (255) | $ (271)
Aggregate fair value | [2] | $ 24,163 | $ 20,265
[1] | Including accrued interest in the amount of US$ 339 thousand and US$ 256 thousand as of December 31, 2014 and 2015 respectively.
[2] | Fair value is being determined using quoted market prices in active markets (Level 1).

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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=27724398&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=51813488&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=27724398&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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