Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (Details)

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Selected Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 129,099 $ 110,281 $ 123,323 $ 124,393 $ 115,213 $ 107,403 $ 99,655 $ 77,715 $ 487,096 $ 399,986 $ 507,265
Operating income (loss) 33,166 15,700 32,888 28,196 21,319 [1] (58,276) [1] (126,997) [1] (166,614) [1] 109,950 (330,568) (1,145,703)
Net income (loss) $ 23,365 $ (1,297) $ 33,315 $ 24,299 $ 16,483 [1] $ 45,928 [1] $ (120,922) [1] $ (190,509) [1] $ 79,682 $ (249,020) $ (1,044,718)
Basic and diluted earnings (loss) per common share $ 0.16 $ (0.01) $ 0.23 $ 0.17 $ 0.12 [1],[2] $ 0.48 [1],[2] $ (1.58) [1],[2] $ (2.49) [1],[2] $ 0.56 $ (2.60) $ (13.76)
[1] During 2016, we recorded in first, second and third quarter ceiling test write-downs of oil and natural gas properties of $116.6 million, $104.6 million and $57.9 million, respectively. In the third quarter of 2016, we recorded a gain on exchange of debt of $123.9 million. See Note 1 and Note 2 for additional information.
[2] The sum of the individual quarterly earnings (loss) per share does not agree with the year loss per share because each quarterly calculation is based on the income for that quarter and the weighted average number of shares outstanding during that quarter. During the third quarter of 2016, 60.4 million shares of common stock were issued in conjunction with the Exchange Transaction.