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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Interest rate swaps | [1] | $ 69 | $ 158
Money market mutual funds |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 7,318 | 21,848
United States treasuries |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 1,001 |
Certificates of deposit |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] |  | 3,864
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] | 7,318 | 21,848
Level 1 | United States treasuries |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 1,001 |
Level 1 | Certificates of deposit |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] |  | 3,864
Level 2 |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Interest rate swaps | [1] | 69 | 158
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 | United States treasuries |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | 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
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 | United States treasuries |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |
Assets measured at fair value | [2] | $ 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
[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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