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Fair Value Measurements Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Cash and cash equivalents | $ 147,762 | $ 172,628
Acquisition-related future consideration liabilities | 2,090 | 2,161
Other Current Liabilities [Member] |  |
Acquisition-related future consideration liabilities | 700 |
Other Noncurrent Liabilities [Member] |  |
Acquisition-related future consideration liabilities | 1,400 |
Money Market Funds [Member] |  |
Cash and cash equivalents | $ 140,900 | $ 162,200

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