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

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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 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: 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 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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