Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments - Additional Information (Details)

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Equity Method Investments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Equity [Abstract]    
Income (loss) from equity method investments $ (2,285) $ 4,171