Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures (Unaudited Pro Forma Financial Information) (Details)

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Acquisitions and Divestitures (Unaudited Pro Forma Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Carrizo    
Business Acquisition [Line Items]    
Revenues $ 1,620,357 $ 1,661,171
Income (loss) from operations 614,668 767,628
Income (loss) available to common stockholders $ 369,777 $ 734,527
Net income (loss) per common share:    
Basic (in dollars per share) $ 0.89 $ 1.87
Diluted (in dollars per share) $ 0.89 $ 1.87
Cimarex Energy Company    
Business Acquisition [Line Items]    
Revenues   $ 669,236
Income (loss) from operations   299,090
Income (loss) available to common stockholders   $ 324,318
Net income (loss) per common share:    
Basic (in dollars per share)   $ 1.49
Diluted (in dollars per share)   $ 1.49