Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures - Additional Information (Details)

v3.3.1.900
Acquisitions and Divestitures - Additional Information (Details)
 3 Months Ended 7 Months Ended 12 Months Ended
Oct. 15, 2015
USD ($)
a
$ / bbl
Sep. 26, 2013
USD ($)
Jul. 11, 2013
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Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 15, 2014
Sep. 14, 2014
May. 20, 2014
Oct. 17, 2013
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%                                      
Goodwill, acquired during period                             $ 0 $ 0        
Revenues       $ 104,064,000 $ 126,228,000 $ 149,066,000 $ 127,907,000 $ 196,677,000 $ 234,521,000 $ 262,994,000 $ 254,516,000     $ 507,265,000 948,708,000 984,088,000        
DD&A                           394,071,000 511,102,000 451,529,000        
Income tax expense                           (202,984,000) (4,459,000) 28,774,000        
Net income (loss)       $ (51,606,000) [1] $ (477,568,000) [1] $ (260,449,000) [1] $ (255,095,000) [1] $ (33,371,000) $ 684,000 $ 9,837,000 $ 11,189,000     (1,044,718,000) (11,661,000) 51,322,000        
Green Canyon Fields                                        
Business Acquisition [Line Items]                                        
Proceeds from sale of properties     $ 4,300,000                                  
Reversal of asset retirement obligation     $ 15,600,000                                  
West Delta Area Block Twenty Nine                                        
Business Acquisition [Line Items]                                        
Proceeds from sale of properties   $ 14,700,000                                    
Reversal of asset retirement obligation   $ 3,900,000                                    
West Delta Area Block Twenty Nine | Post Effective Date Repayment                                        
Business Acquisition [Line Items]                                        
Proceeds from sale of properties                             1,700,000          
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            
Callon Properties                                        
Business Acquisition [Line Items]                                        
Percentage of working interest                                       15.00%
Payments for previous acquisition                             600,000          
Goodwill, acquired during period                               $ 0        
Revenues                       $ 5,800,000     32,500,000          
Direct operating expenses                       1,300,000     6,600,000          
DD&A                       2,400,000     16,400,000          
Income tax expense                       700,000     3,300,000          
Net income (loss)                       $ 1,400,000     $ 6,200,000          
NYMEX                                        
Business Acquisition [Line Items]                                        
Addition to available cash $ 100,000,000                                      
Crude Oil | NYMEX | Minimum                                        
Business Acquisition [Line Items]                                        
Trading price per barrel | $ / bbl 70.00                                      
Crude Oil | NYMEX | Maximum                                        
Business Acquisition [Line Items]                                        
Trading price per barrel | $ / bbl 90.00                                      
Ajax Resources, LLC                                        
Business Acquisition [Line Items]                                        
Proceeds from sale of properties $ 372,900,000                                      
Acres of oil and gas property, net | a 25,800                                      
Agreement effective date Jan. 01, 2015                                      
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%                                      
[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.