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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]        
Gross revenue $ 86,732 $ 130,134 $ 130,039 $ 263,690
Net (loss) income $ (560) $ (45,246) $ (25,868) $ 45,422