Annual report pursuant to Section 13 and 15(d)

Supplemental Guarantor Information (Condensed Consolidating Statement Of Income) (Details)

v2.4.0.6
Supplemental Guarantor Information (Condensed Consolidating Statement Of Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues $ 261,899 $ 245,371 $ 252,922 $ 210,855 $ 186,956 $ 169,575 $ 179,667 $ 169,585 $ 971,047 $ 705,783 $ 610,996
Lease operating expenses                 219,206 169,670 203,922
Production taxes                 4,275 1,194 1,544
Gathering and transportation                 16,920 16,484 13,619
Depreciation, depletion and amortization                 299,015 268,415 308,076
Asset retirement obligation accretion                 29,771 25,685 34,461
General and administrative expenses                 74,296 53,290 42,990
Derivative (gain) loss                 (1,896) 4,256 7,372
Total costs and expenses                 641,587 538,994 830,855
Operating income 80,936 95,333 115,643 37,548 34,053 36,847 40,178 55,711 329,460 166,789 (219,859)
Earnings of affiliates                       
Incurred                 52,393 43,101 46,749
Capitalized                 (9,877) (5,395) (6,662)
Loss on extinguishment of debt                 22,694   2,926
Interest income                 84 710 842
Income before income tax expense                 264,334 129,793 (262,030)
Income tax expense (benefit)                 91,517 11,901 (74,111)
Net income 46,065 52,928 55,175 18,649 20,519 27,188 27,870 42,315 172,817 117,892 (187,919)
Parent Company [Member]
                      
Revenues                 697,899 608,600  
Lease operating expenses                 182,165 152,534  
Production taxes                 4,275 1,194  
Gathering and transportation                 12,676 15,338  
Depreciation, depletion and amortization                 214,740 241,105  
Asset retirement obligation accretion                 26,947 25,122  
General and administrative expenses                 71,714 51,662  
Derivative (gain) loss                 (1,896) 4,256  
Total costs and expenses                 510,621 491,211  
Operating income                 187,278 117,389  
Earnings of affiliates                 (92,533) (32,110)  
Incurred                 52,393 43,101  
Capitalized                 (9,877) (5,395)  
Loss on extinguishment of debt                 22,694    
Interest income                 84 710  
Income before income tax expense                 214,685 112,503  
Income tax expense (benefit)                 41,868 (5,389)  
Net income                 172,817 117,892  
Guarantor Subsidiaries [Member]
                      
Revenues                 273,148 97,183  
Lease operating expenses                 37,041 17,136  
Production taxes                        
Gathering and transportation                 4,244 1,146  
Depreciation, depletion and amortization                 84,275 27,310  
Asset retirement obligation accretion                 2,824 563  
General and administrative expenses                 2,582 1,628  
Derivative (gain) loss                       [1]  
Total costs and expenses                 130,966 47,783  
Operating income                 142,182 49,400  
Earnings of affiliates                       [1]  
Incurred                        
Capitalized                        
Loss on extinguishment of debt                       
Interest income                        
Income before income tax expense                 142,182 49,400  
Income tax expense (benefit)                 49,649 17,290  
Net income                 92,533 32,110 [1]  
Eliminations [Member]
                      
Derivative (gain) loss                       
Earnings of affiliates                 92,533 32,110  
Income before income tax expense                 (92,533) (32,110)  
Net income                 $ (92,533) $ (32,110)  
[1] Began operations on May 1, 2010.