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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]        
Gross revenue $ 130,134 $ 220,013 $ 263,690 $ 378,294
Net (loss) income $ (45,246) $ 26,099 $ 45,422 $ 207,604