Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Unaudited Pro Forma Financial Information) (Details)

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Acquisitions (Unaudited Pro Forma Financial Information) (Details) - Howard County, Texas [Member] - Big Star Transaction [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition [Line Items]        
Revenues $ 48,937 $ 45,047 $ 85,010 $ 78,060
Income from operations (50,004) 6,179 (85,405) (7,695)
Income available to common stockholders $ (68,452) $ (3,011) $ (108,202) $ (12,176)
Net income per common share Basic $ (0.58) $ (0.03) $ (1.07) $ (0.13)
Net income per common share Diluted $ (0.58) $ (0.03) $ (1.07) $ (0.13)