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Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Current Assets:    
Available-for-sale securities $ 39,640 $ 23,874
Noncurrent Assets:    
Available-for-sale securities 5,996 5,718
Equity method investments 22,217 22,021
Cost method investments 9,986 10,092
Other investments 33,548 33,251
Total classified as non-current assets 71,747 71,082
Total $ 111,387 $ 94,956