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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 104,064 $ 126,228 $ 149,066 $ 127,907 $ 196,677 $ 234,521 $ 262,994 $ 254,516 $ 507,265 $ 948,708 $ 984,088
Operating income (loss) (60,816) [1] (468,573) [1] (278,806) [1] (337,508) [1] (30,543) 20,983 34,403 37,225 (1,145,703) 62,068 146,731
Net income (loss) $ (51,606) [1] $ (477,568) [1] $ (260,449) [1] $ (255,095) [1] $ (33,371) $ 684 $ 9,837 $ 11,189 $ (1,044,718) $ (11,661) $ 51,322
Basic and diluted earnings (loss) per common share $ (0.68) [1],[2] $ (6.29) [1],[2] $ (3.43) [1],[2] $ (3.36) [1],[2] $ (0.44) [2] $ 0.01 [2] $ 0.13 [2] $ 0.15 [2] $ (13.76) $ (0.16) $ 0.68
[1] 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 may 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.