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Investments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | $ 5,844 us-gaap_HeldToMaturitySecuritiesCurrent | $ 5,914 us-gaap_HeldToMaturitySecuritiesCurrent
Municipal Bonds [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | 5,844 us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 5,914 us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Amortized Cost, Due from one through five years | 13,116 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 14,398 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Amortized Cost, Due from six through ten years | 8,957 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 9,337 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Amortized Cost, Due from eleven through twenty years | 1,097 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 805 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Amortized Cost, Total | 29,014 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 30,454 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Market Value, Current | 5,919 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 6,006 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Market Value, Due from one through five years | 13,856 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 15,204 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Market Value, Due from six through ten years | 9,366 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 9,711 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Market Value, Due from eleven through twenty years | 1,069 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 762 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Market Value, Total | $ 30,210 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | $ 31,683 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember

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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 + Details
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- Definition Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Fair value of held-to-maturity debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(4) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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