Annual report pursuant to Section 13 and 15(d)

Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details)

v3.6.0.2
Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share, Basic and Diluted                      
Net income (loss) $ (1,746) [1] $ 21,139 [1] $ (70,097) [1] $ (41,109) [1] $ (113,170) [2] $ (111,805) [2] $ (4,967) [2] $ (10,197) [2] $ (91,813) $ (240,139) $ 37,766
Preferred stock dividends                 (7,295) (7,895) (7,895)
Income (loss) available to common stockholders $ (3,570) $ 19,315 $ (71,920) $ (42,933) $ (115,144) $ (113,779) $ (6,940) $ (12,171) $ (99,108) $ (248,034) $ 29,871
Weighted average shares outstanding                 126,258 65,708 44,848
Weighted average shares outstanding for diluted income (loss) per share [3]                 126,258 65,708 45,961
Basic income (loss) per share $ (0.02) $ 0.14 $ (0.61) $ (0.51) $ (1.58) $ (1.72) $ (0.11) $ (0.21) $ (0.78) $ (3.77) $ 0.67
Diluted income (loss) per share $ (0.02) $ 0.14 $ (0.61) $ (0.51) $ (1.58) $ (1.72) $ (0.11) $ (0.21) $ (0.78) $ (3.77) $ 0.65
Options [Member]                      
Earnings Per Share, Basic and Diluted                      
Excluded from the diluted EPS calculation because their effect would be anti-dilutive [4]                 15 15 30
Restricted Stock [Member]                      
Earnings Per Share, Basic and Diluted                      
Dilutive impact                     1,113
Excluded from the diluted EPS calculation because their effect would be anti-dilutive [4]                   126 317
[1] Loss from operations and net loss for the three months ended March, 31, 2016 and June 30, 2016 included write-downs of oil and natural gas properties of $34,776 and $61,012, respectively.
[2] Loss from operations and net loss for the three months ended September 30, 2015 and December 31, 2015 included write-downs of oil and natural gas properties of $87,301 and $121,134, respectively.
[3] Because the Company reported a loss available to common stockholders for the years ended December 31, 2016, and 2015, no unvested stock awards were included in computing loss per share because the effect was anti-dilutive.
[4] Shares excluded from the diluted earnings per share calculation because their effect would be anti-dilutive.