Investments and Other Assets (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||
| Investments And Other Assets [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Other Assets |
Other assets consist of the following as of December 31:
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| X | ||||||||||
- Definition Investments and other assets. No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of noncurrent assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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