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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Assets: |  |  |
Assets fair value | $ 131,881 | $ 161,541 |
Liabilities: |  |  |
Liabilities fair value |  | 154 |
Level 1 |  |  |
Assets: |  |  |
Assets fair value | 18,771 | 13,761 |
Level 2 |  |  |
Assets: |  |  |
Assets fair value | 113,110 | 147,780 |
Liabilities: |  |  |
Liabilities fair value |  | 154 |
Cash equivalents | Money Market Funds |  |  |
Assets: |  |  |
Assets fair value | 18,771 | 13,761 |
Cash equivalents | Commercial Paper |  |  |
Assets: |  |  |
Assets fair value | 9,649 | 19,629 |
Cash equivalents | Level 1 | Money Market Funds |  |  |
Assets: |  |  |
Assets fair value | 18,771 | 13,761 |
Cash equivalents | Level 2 | Commercial Paper |  |  |
Assets: |  |  |
Assets fair value | 9,649 | 19,629 |
Short-term Investments | Municipal Bonds |  |  |
Assets: |  |  |
Assets fair value | 24,920 | 29,106 |
Short-term Investments | Corporate Debt Securities |  |  |
Assets: |  |  |
Assets fair value | 50,892 | 76,786 |
Short-term Investments | Asset-backed securities |  |  |
Assets: |  |  |
Assets fair value | 13,616 | 4,209 |
Short-term Investments | U.S. Government Agency Bonds |  |  |
Assets: |  |  |
Assets fair value | 14,033 | 18,050 |
Short-term Investments | Level 2 | Municipal Bonds |  |  |
Assets: |  |  |
Assets fair value | 24,920 | 29,106 |
Short-term Investments | Level 2 | Corporate Debt Securities |  |  |
Assets: |  |  |
Assets fair value | 50,892 | 76,786 |
Short-term Investments | Level 2 | Asset-backed securities |  |  |
Assets: |  |  |
Assets fair value | 13,616 | 4,209 |
Short-term Investments | Level 2 | U.S. Government Agency Bonds |  |  |
Assets: |  |  |
Assets fair value | 14,033 | 18,050 |
Interest rate swap contract |  |  |
Liabilities: |  |  |
Liabilities fair value |  | 154 | [1]
Interest rate swap contract | Level 2 |  |  |
Liabilities: |  |  |
Liabilities fair value |  | $ 154 | [1]
[1] | As of December 31, 2013, the fair value of the interest rate swap contract was classified on our Balance Sheet in other current liabilities.

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