Equity Investments - Income Statement Disclosure (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Gross revenue	$ 1,729,778	$ 755,374	$ 287,733
Net income (loss)	$ 253,451	$ (37,102)	$ (65,070)

The amount of net income (loss) reported by an equity method investment of the entity.

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