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Schedule of Earnings of Equity Method Investments Within The Consolidated Statements of Operations and Comprehensive Income (Loss ) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Equity Method Investments And Joint Ventures [Abstract]    
Earnings of equity method investments $ 52 $ 286
(Losses) earnings of equity method investments included within other income (3) 5
Total earnings of equity method investments $ 49 $ 291