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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of assets and liabilities measured at fair value on recurring basis
Interest Rate Derivative Liabilities, at Fair Value Disclosure	$ 308us-gaap_InterestRateDerivativeLiabilitiesAtFairValue	$ 295us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
Fair Value, Inputs, Level 1
Schedule of assets and liabilities measured at fair value on recurring basis
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Fair Value, Inputs, Level 2
Schedule of assets and liabilities measured at fair value on recurring basis
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Fair Value, Inputs, Level 3
Schedule of assets and liabilities measured at fair value on recurring basis
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Money market mutual funds [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
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Money market mutual funds [Member] | Fair Value, Inputs, Level 1
Schedule of assets and liabilities measured at fair value on recurring basis
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Money market mutual funds [Member] | Fair Value, Inputs, Level 2
Schedule of assets and liabilities measured at fair value on recurring basis
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Money market mutual funds [Member] | Fair Value, Inputs, Level 3
Schedule of assets and liabilities measured at fair value on recurring basis
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Government agency bonds [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
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Government agency bonds [Member] | Fair Value, Inputs, Level 1
Schedule of assets and liabilities measured at fair value on recurring basis
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Government agency bonds [Member] | Fair Value, Inputs, Level 2
Schedule of assets and liabilities measured at fair value on recurring basis
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Government agency bonds [Member] | Fair Value, Inputs, Level 3
Schedule of assets and liabilities measured at fair value on recurring basis
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US Treasury Securities
Schedule of assets and liabilities measured at fair value on recurring basis
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US Treasury Securities | Fair Value, Inputs, Level 1
Schedule of assets and liabilities measured at fair value on recurring basis
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US Treasury Securities | Fair Value, Inputs, Level 2
Schedule of assets and liabilities measured at fair value on recurring basis
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US Treasury Securities | Fair Value, Inputs, Level 3
Schedule of assets and liabilities measured at fair value on recurring basis
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Municipal Bonds [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
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Municipal Bonds [Member] | Fair Value, Inputs, Level 1
Schedule of assets and liabilities measured at fair value on recurring basis
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Municipal Bonds [Member] | Fair Value, Inputs, Level 2
Schedule of assets and liabilities measured at fair value on recurring basis
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Municipal Bonds [Member] | Fair Value, Inputs, Level 3
Schedule of assets and liabilities measured at fair value on recurring basis
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Corporate notes [Member]
Schedule of assets and liabilities measured at fair value on recurring basis
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Corporate notes [Member] | Fair Value, Inputs, Level 1
Schedule of assets and liabilities measured at fair value on recurring basis
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Corporate notes [Member] | Fair Value, Inputs, Level 2
Schedule of assets and liabilities measured at fair value on recurring basis
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Corporate notes [Member] | Fair Value, Inputs, Level 3
Schedule of assets and liabilities measured at fair value on recurring basis
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Certificates of Deposit
Schedule of assets and liabilities measured at fair value on recurring basis
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Certificates of Deposit | Fair Value, Inputs, Level 1
Schedule of assets and liabilities measured at fair value on recurring basis
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Certificates of Deposit | Fair Value, Inputs, Level 2
Schedule of assets and liabilities measured at fair value on recurring basis
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Certificates of Deposit | Fair Value, Inputs, Level 3
Schedule of assets and liabilities measured at fair value on recurring basis
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X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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X

- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

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