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, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]        
Gross revenue $ 220,013 $ 81,496 $ 378,294 $ 138,434
Net income (loss) $ 26,099 $ (5,119) $ 207,604 $ 15,508