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Fair Value Measurements Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Cash and cash equivalents | $ 172,628 | $ 115,267
Fair value of acquisition-related future consideration liabilities | 2,161 | 1,909
Other Current Liabilities [Member] |  |
Fair value of acquisition-related future consideration liabilities | 700 |
Other Noncurrent Liabilities [Member] |  |
Fair value of acquisition-related future consideration liabilities | 1,500 |
Money Market Funds [Member] |  |
Cash and cash equivalents | $ 162,200 | $ 107,600

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