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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Interest rate swaps | [1] | $ 238 | $ 295
Money market mutual funds |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 13,244 | 6,824
Government agency bonds |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] |  | 3,502
United States treasuries |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 1,002 | 4,006
Corporate notes |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 2,284 | 4,667
Certificates of deposit |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 6,089 | 4,155
Municipal Bonds [Member] |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] |  | 1,359
Level 1 |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Interest rate swaps | [1] | 0 | 0
Level 1 | Money market mutual funds |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 13,244 | 6,824
Level 1 | Government agency bonds |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] |  | 3,502
Level 1 | United States treasuries |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 1,002 | 4,006
Level 1 | Corporate notes |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 0 | 4,667
Level 1 | Certificates of deposit |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 6,089 | 4,155
Level 1 | Municipal Bonds [Member] |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] |  | 0
Level 2 |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Interest rate swaps | [1] | 238 | 295
Level 2 | Money market mutual funds |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 0 | 0
Level 2 | Government agency bonds |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] |  | 0
Level 2 | United States treasuries |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 0 | 0
Level 2 | Corporate notes |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 2,284 | 0
Level 2 | Certificates of deposit |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 0 | 0
Level 2 | Municipal Bonds [Member] |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] |  | 1,359
Level 3 |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Interest rate swaps | [1] | 0 | 0
Level 3 | Money market mutual funds |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 0 | 0
Level 3 | Government agency bonds |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] |  | 0
Level 3 | United States treasuries |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 0 | 0
Level 3 | Corporate notes |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 0 | 0
Level 3 | Certificates of deposit |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | $ 0 | 0
Level 3 | Municipal Bonds [Member] |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] |  | $ 0
[1] | The valuations of the interest rate swaps intended to mitigate the Company’s interest rate risk are determined with the assistance of a third-party financial institution using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each instrument. This analysis utilizes observable market-based inputs, including interest rate curves and interest rate volatility, and reflects the contractual terms of these instruments, including the period to maturity.
[2] | Market approach—prices and other relevant information generated by market transactions involving identical or comparable assets.

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