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Divestiture (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
Discontinued Operations and Disposal Groups [Abstract]        
Cash proceeds from sale of non-operated properties     $ 324,888 $ 0
Gain on sale of properties $ 3,640 $ 0 $ 187,033 $ 0