Annual report pursuant to Section 13 and 15(d)

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

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Acquisitions and Dispositions (Unaudited Pro Forma Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Combinations [Abstract]      
Revenues $ 369,527 $ 243,273 $ 168,506
Income (loss) from operations 144,104 (39,730) (131,435)
Income (loss) available to common stockholders $ 115,787 $ (82,612) $ (153,735)
Earnings Per Share, Pro Forma [Abstract]      
Basic (in usd per share) $ 0.57 $ (0.50) $ (1.18)
Diluted (in usd per share) $ 0.57 $ (0.50) $ (1.18)