Quarterly report pursuant to Section 13 or 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
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]    
Gross revenue $ 511,133 $ 94,478
Net income (loss) $ 64,452 $ (25,339)