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Marketable Securities Marketable Securities, Gains and Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 26,096 | $ 25,490
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 117 | 90
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (57) | (54)
Available-for-sale Securities, Debt Securities | 26,156 | 25,526
Corporate Debt Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 19,804 | 18,832
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 89 | 68
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (55) | (43)
Available-for-sale Securities, Debt Securities | 19,838 | 18,857
Municipal Bonds [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 6,292 | 6,658
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 28 | 22
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (2) | (11)
Available-for-sale Securities, Debt Securities | $ 6,318 | $ 6,669

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt 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=27724398&loc=d3e27161-111563 + Details
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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=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity 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 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 of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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