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Marketable Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Marketable Securities, Realized Gain (Loss) | $ 27 | $ 27 | $ 88 | $ 93 |
Available-for-sale Debt Securities, Amortized Cost Basis | 26,596 |  | 26,596 |  | $ 24,509
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 3 |  | 3 |  | 7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |  | (3)
Available-for-sale Securities | 26,599 |  | 26,599 |  | 24,513
Municipal Bonds [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  |  |  |  | 1,358
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  |  |  | 1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  |  |  | 0
Available-for-sale Securities |  |  |  |  | 1,359
Corporate Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 2,528 |  | 2,528 |  | 4,665
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 |  | 1 |  | 2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |  | 0
Available-for-sale Securities | 2,529 |  | 2,529 |  | 4,667
Government Agency Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,503 |  | 1,503 |  | 3,505
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |  | (3)
Available-for-sale Securities | 1,503 |  | 1,503 |  | 3,502
Mutual Funds, Money Market [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 15,722 |  | 15,722 |  | 6,824
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |  | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |  | 0
Available-for-sale Securities | 15,722 |  | 15,722 |  | 6,824
Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis | 4,311 |  | 4,311 |  | 7,663
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value | 4,314 |  | 4,314 |  | 7,668
Available-for-sale Securities, Debt Maturities, Year Two, Amortized Cost Basis | 6,563 |  | 6,563 |  | 10,022
Available-for-sale Securities, Debt Maturities, Year Two, Fair Value | 6,563 |  | 6,563 |  | 10,021
Available-for-sale Debt Securities, Amortized Cost Basis | 10,874 |  | 10,874 |  | 17,685
Available-for-sale Securities | $ 10,877 |  | $ 10,877 |  | $ 17,689

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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=27724398&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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