Annual report pursuant to Section 13 and 15(d)

Equity Investments - Equity Investment Income Statement Disclosure (Details)

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Equity Investments - Equity Investment Income Statement Disclosure (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]      
Gross revenue $ 755,374 $ 287,733 $ 430,729
Net (loss) income $ (37,102) $ (65,070) $ 16,761