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v3.3.1.900

Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Cash equivalents |  |  |  |
Total | $ 269,232 | $ 270,811 | $ 210,799 | $ 384,557
Other |  |  |  |
Assets held for sale | 5,000 | 6,000 |  |
Assets measured on a recurring basis |  |  |  |
Cash equivalents |  |  |  |
Total | 17,996 |  |  |
Short-term investments |  |  |  |
Total | 116,050 | 120,572 |  |
Other |  |  |  |
Assets held for sale | 5,000 | 6,000 |  |
Total | 5,000 | 6,000 |  |
Assets measured on a recurring basis | U.S. treasuries |  |  |  |
Cash equivalents |  |  |  |
Total | 9,999 |  |  |
Short-term investments |  |  |  |
Total | 94,918 | 81,527 |  |
Assets measured on a recurring basis | Corporate debt |  |  |  |
Short-term investments |  |  |  |
Total | 8,144 | 39,045 |  |
Assets measured on a recurring basis | Government agency securities |  |  |  |
Cash equivalents |  |  |  |
Total | 4,998 |  |  |
Short-term investments |  |  |  |
Total | 12,988 |  |  |
Assets measured on a recurring basis | Commercial paper |  |  |  |
Cash equivalents |  |  |  |
Total | 2,999 |  |  |
Assets measured on a recurring basis | Level 1 |  |  |  |
Cash equivalents |  |  |  |
Total | 9,999 |  |  |
Short-term investments |  |  |  |
Total | 94,918 | 81,527 |  |
Assets measured on a recurring basis | Level 1 | U.S. treasuries |  |  |  |
Cash equivalents |  |  |  |
Total | 9,999 |  |  |
Short-term investments |  |  |  |
Total | 94,918 | 81,527 |  |
Assets measured on a recurring basis | Level 2 |  |  |  |
Cash equivalents |  |  |  |
Total | 7,997 |  |  |
Short-term investments |  |  |  |
Total | 21,132 | 39,045 |  |
Other |  |  |  |
Assets held for sale | 5,000 | 6,000 |  |
Total | 5,000 | 6,000 |  |
Assets measured on a recurring basis | Level 2 | Corporate debt |  |  |  |
Short-term investments |  |  |  |
Total | 8,144 | $ 39,045 |  |
Assets measured on a recurring basis | Level 2 | Government agency securities |  |  |  |
Cash equivalents |  |  |  |
Total | 4,998 |  |  |
Short-term investments |  |  |  |
Total | 12,988 |  |  |
Assets measured on a recurring basis | Level 2 | Commercial paper |  |  |  |
Cash equivalents |  |  |  |
Total | $ 2,999 |  |  |

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