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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]        
Gross revenue $ 160,950 $ 76,627 $ 357,901 $ 206,666
Net income (loss) $ 2,101 $ 35,212 $ (109,651) $ 9,344