|12 Months Ended|
Dec. 31, 2018
|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, 2018 and 2017:
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.
No definition available.