Fair Value Measurements - Additional Information (Details) - DerivativeInstrument |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Fair Value Disclosures [Abstract] | ||
| Number of open derivative financial instruments | 0 | 0 |
| X | ||||||||||
- Definition The number of derivative instruments of a particular group held by the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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