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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]        
Gross revenue $ 566,404 $ 99,640 $ 1,067,537 $ 194,118
Net income (loss) $ 49,018 $ (67,336) $ 113,470 $ (92,675)