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Fair Value Measurements (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Sale leaseback obligation |  |
Fair Value Measurements |  |
Implicit interest rate on associated cash flows | 10.65% |
Recurring | Total | Sale leaseback obligation |  |
Fair Value Measurements |  |
Sale leaseback obligation | $ 47,586 | $ 47,586
Recurring | Money market accounts | Total |  |
Fair Value Measurements |  |
Money market funds | 43,815 | 65,327
Recurring | Level 1 | Money market accounts |  |
Fair Value Measurements |  |
Money market funds | 43,815 | 65,327
Recurring | Level 3 | Sale leaseback obligation |  |
Fair Value Measurements |  |
Sale leaseback obligation | $ 47,586 | $ 47,586

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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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