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Marketable Securities (Narrative) (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) Number | Dec. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |
Available-For-Sale Securities Number of Securities Owned | Number | 42 |
Available-For-Sale Securities Number Of Securities Owned Unrealized Losses | Number | 14 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ | $ 18 | $ 50
Available-for-sale Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ | $ 100 |

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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