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Marketable Securities (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Loss | $ 50 | $ 73
Available-For-Sale Securities Number of Securities Owned | 47 |
Available-For-Sale Securities Number Of Securities Owned Unrealized Losses | 35 |
Available-for-sale Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Loss | $ 100 |
Auction Rate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Proceeds from Sale of Available-for-sale Securities, Total |  | 1,800
Available-for-sale Securities, Gross Realized Gain (Loss) |  | $ 600

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