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Divestiture (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Discontinued Operations and Disposal Groups [Abstract]        
Cash proceeds from sale of non-operated properties     $ 324,938 $ 0
Gain on sale of properties $ 43 $ 0 $ 187,076 $ 0