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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Cash and cash equivalents | $ 264,008 | $ 210,799 | $ 247,666 | $ 384,557
Short-term investments | 222,954 | 281,538 |  |
Assets and liabilities measured on a recurring basis | Level 1 | U.S. treasuries |  |  |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Cash and cash equivalents | 25,000 |  |  |
Short-term investments | 90,558 | 130,977 |  |
Assets and liabilities measured on a recurring basis | Level 2 |  |  |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Derivative instrument |  | 907 |  |
Assets and liabilities measured on a recurring basis | Level 2 | Commercial paper |  |  |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Cash and cash equivalents | 3,999 |  |  |
Short-term investments |  | 11,947 |  |
Assets and liabilities measured on a recurring basis | Level 2 | Corporate debt |  |  |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Short-term investments | 69,198 | 77,601 |  |
Assets and liabilities measured on a recurring basis | Level 2 | Government agency securities |  |  |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Short-term investments | 63,198 | 61,013 |  |
Assets and liabilities measured on a recurring basis | Level 3 |  |  |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Contingent consideration |  | (29,368) |  |
Assets and liabilities measured on a recurring basis | Fair Value |  |  |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Derivative instrument |  | 907 |  |
Contingent consideration |  | (29,368) |  |
Assets and liabilities measured on a recurring basis | Fair Value | U.S. treasuries |  |  |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Cash and cash equivalents | 25,000 |  |  |
Short-term investments | 90,558 | 130,977 |  |
Assets and liabilities measured on a recurring basis | Fair Value | Commercial paper |  |  |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Cash and cash equivalents | 3,999 |  |  |
Short-term investments |  | 11,947 |  |
Assets and liabilities measured on a recurring basis | Fair Value | Corporate debt |  |  |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Short-term investments | 69,198 | 77,601 |  |
Assets and liabilities measured on a recurring basis | Fair Value | Government agency securities |  |  |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |  |  |
Short-term investments | $ 63,198 | $ 61,013 |  |

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