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Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Restricted short-term investments: |  |
Fair value measurement | $ 43,771 | $ 44,489
Money market accounts |  |
Cash equivalents: |  |
Cash equivalents | 42,486 | 42,994
Certificates of deposit |  |
Restricted short-term investments: |  |
Restricted short-term investments | 1,285 | 1,495
Level 1 |  |
Restricted short-term investments: |  |
Fair value measurement | 43,771 | 44,489
Level 1 | Money market accounts |  |
Cash equivalents: |  |
Cash equivalents | 42,486 | 42,994
Level 1 | Certificates of deposit |  |
Restricted short-term investments: |  |
Restricted short-term investments | $ 1,285 | $ 1,495

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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