Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands |
Mar. 31, 2018 |
Dec. 31, 2017 |
Mar. 31, 2017 |
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| Summary of Significant Accounting Policies [Abstract] | |||
| Restricted cash | $ 7,458 | $ 7,558 | $ 7,557 |
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- References No definition available.
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- Definition Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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