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Marketable Securities Maturity Schedule (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |
Marketable Securities, Realized Gain (Loss) | $ 20 | $ 30 |
Available-for-sale Debt Securities, Amortized Cost Basis | 22,638 |  | $ 22,618
Available-for-sale Securities | 22,638 |  | 22,619
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0
Mutual Funds, Money Market [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 15,551 |  | 13,244
Available-for-sale Securities | 15,551 |  | 13,244
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0
Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis | 4,585 |  | 5,515
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value | 4,585 |  | 5,516
Available-for-sale Securities, Debt Maturities, Year Two, Amortized Cost Basis | 2,502 |  | 3,859
Available-for-sale Securities, Debt Maturities, Year Two, Fair Value | 2,502 |  | 3,859
Available-for-sale Debt Securities, Amortized Cost Basis | 7,087 |  | 9,374
Available-for-sale Securities | 7,087 |  | 9,375
US Treasury Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  |  | 1,002
Available-for-sale Securities |  |  | 1,002
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,001 |  | 2,283
Available-for-sale Securities | 1,001 |  | 2,284
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0
Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 6,086 |  | 6,089
Available-for-sale Securities | 6,086 |  | 6,089
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 0 |  | $ 0

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before tax of unrealized gain 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 (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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