Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures - Additional Information (Details)

v3.6.0.2
Acquisitions and Divestitures - Additional Information (Details)
 3 Months Ended 7 Months Ended 12 Months Ended
Oct. 15, 2015
USD ($)
a
$ / bbl
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 15, 2014
Sep. 14, 2014
May 20, 2014
Business Acquisition [Line Items]                                
Gain (loss) on disposition of proved property $ 0                              
Limit on percentage of reserves related to recognition of gain or loss 25.00%                              
Revenues   $ 115,213,000 $ 107,403,000 $ 99,655,000 $ 77,715,000 $ 104,064,000 $ 126,228,000 $ 149,066,000 $ 127,907,000   $ 399,986,000 $ 507,265,000 $ 948,708,000      
DD&A                     211,609,000 394,071,000 511,102,000      
Income tax expense                     (43,376,000) (202,984,000) (4,459,000)      
Net income (loss)   $ 16,483,000 [1] $ 45,928,000 [1] $ (120,922,000) [1] $ (190,509,000) [1] $ (51,606,000) [1] $ (477,568,000) [1] $ (260,449,000) [1] $ (255,095,000) [1]   (249,020,000) (1,044,718,000) $ (11,661,000)      
Fairway                                
Business Acquisition [Line Items]                                
Percentage of working interest                           100.00% 64.30%  
Payments for previous acquisition                       1,300,000        
Goodwill, acquired during period                       0        
Woodside Properties                                
Business Acquisition [Line Items]                                
Percentage of working interest                               20.00%
Payments for previous acquisition                       200,000        
Goodwill, acquired during period                       0        
Revenues                   $ 28,400,000   24,400,000        
Direct operating expenses                   5,500,000   9,500,000        
DD&A                   11,000,000   14,400,000        
Income tax expense                   4,200,000   0        
Net income (loss)                   $ 7,700,000   $ 500,000        
Crude Oil | Minimum                                
Business Acquisition [Line Items]                                
Trading price per barrel | $ / bbl 70.00                              
Crude Oil | Maximum                                
Business Acquisition [Line Items]                                
Trading price per barrel | $ / bbl 90.00                              
Ajax Resources, LLC                                
Business Acquisition [Line Items]                                
Proceeds from sale of properties $ 370,900,000                              
Acres of oil and gas property, net | a 25,800                              
Agreement effective date Jan. 01, 2015                              
Purchase price adjustment, net                     $ 900,000          
Ajax Resources, LLC | Minimum                                
Business Acquisition [Line Items]                                
Overriding royalty interest 1.00%                              
Ajax Resources, LLC | Maximum                                
Business Acquisition [Line Items]                                
Overriding royalty interest 4.00%                              
Ajax Resources, LLC | NYMEX                                
Business Acquisition [Line Items]                                
Addition to available cash $ 100,000,000                              
[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.