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Acquisitions (Unaudited Pro Forma Financial Information) (Details) - Jun. 30, 2014 - Central Midland Basin [Member] - USD ($)
$ / shares in Units, $ in Thousands
Total
Total
Business Acquisition [Line Items]    
Revenues $ 50,819 $ 94,003
Income from operations 17,941 30,298
Income available to common stockholders $ 4,752 $ 5,543
Basic $ 0.09 $ 0.10
Diluted $ 0.08 $ 0.10