Annual report pursuant to Section 13 and 15(d)

Loss Per Share - Schedule of Calculation of Basic and Diluted Loss Per Common Share (Details)

v3.6.0.2
Loss Per Share - Schedule of Calculation of Basic and Diluted Loss Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
 [1]
Sep. 30, 2016
 [1]
Jun. 30, 2016
 [1]
Mar. 31, 2016
 [1]
Dec. 31, 2015
 [1]
Sep. 30, 2015
 [1]
Jun. 30, 2015
 [1]
Mar. 31, 2015
 [1]
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share, Basic and Diluted [Abstract]                      
Net loss $ 16,483 $ 45,928 $ (120,922) $ (190,509) $ (51,606) $ (477,568) $ (260,449) $ (255,095) $ (249,020) $ (1,044,718) $ (11,661)
Less portion allocated to nonvested shares                     269
Net loss allocated to common shares                 $ (249,020) $ (1,044,718) $ (11,930)
Weighted average common shares outstanding                 95,644 75,931 75,609
Basic and diluted loss per common share $ 0.12 [2] $ 0.48 [2] $ (1.58) [2] $ (2.49) [2] $ (0.68) [2] $ (6.29) [2] $ (3.43) [2] $ (3.36) [2] $ (2.60) $ (13.76) $ (0.16)
Shares excluded due to being anti-dilutive (weighted-average)                 5,269 2,195 2,097
[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. During 2015, we recorded in first, second, third and fourth quarter ceiling test write-downs of oil and natural gas properties of $260.4 million, $252.8 million, $441.6 million and $32.4 million, respectively. See Note 1 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.