Investments (Tables) |
12 Months Ended | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 | ||||||||||||||||||||||||||||
| Investments in and Advances to Affiliates, Schedule of Investments [Abstract] | ||||||||||||||||||||||||||||
| Schedule of Investments at Cost |
Investments at cost consist of the following at December 31, 2017 and 2016:
|
|||||||||||||||||||||||||||
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition A tabular disclosure of (a) the aggregate carrying amount of all cost-method investments; (b) the aggregate carrying amount of cost-method investments that the investor did not evaluate for impairment for cost-method investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|