Annual report pursuant to Section 13 and 15(d)

Condensed Consolidating Statement of Income (Detail)

v2.4.0.8
Condensed Consolidating Statement of Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Financial Statements Captions [Line Items]                      
Revenues $ 244,928 [1] $ 244,555 [1] $ 235,383 [1] $ 259,222 [1] $ 237,146 $ 185,946 $ 215,513 $ 235,886 $ 984,088 $ 874,491 $ 971,047
Operating costs and expenses:                      
Lease operating expenses                 270,839 232,260 219,206
Production taxes                 7,135 5,840 4,275
Gathering and transportation                 17,510 14,878 16,920
Depreciation, depletion and amortization                 430,611 336,177 299,015
Asset retirement obligation accretion                 20,918 20,055 29,771
General and administrative expenses                 81,874 82,017 74,296
Derivative (gain) loss                 8,470 13,954 (1,896)
Total costs and expenses                 837,357 705,181 641,587
Operating income 622 [1] 31,965 [1] 53,823 [1] 60,321 [1] 46,737 7,560 99,100 15,913 146,731 169,310 329,460
Interest expense:                      
Incurred                 85,639 63,268 52,393
Capitalized                 (10,058) (13,274) (9,877)
Loss on extinguishment of debt                 128   22,694
Other income                 9,074 215 84
Income before income tax expense                 80,096 119,531 264,334
Income tax expense                 28,774 47,547 91,517
Net income (11,886) [1] 14,194 [1] 22,396 [1] 26,618 [1] 16,670 (1,471) 53,567 3,218 51,322 71,984 172,817
Parent Company
                      
Condensed Financial Statements Captions [Line Items]                      
Revenues                 780,442 659,203 697,899
Operating costs and expenses:                      
Lease operating expenses                 252,511 209,581 182,165
Production taxes                 7,135 5,840 4,275
Gathering and transportation                 13,747 11,703 12,676
Depreciation, depletion and amortization                 324,794 253,807 214,740
Asset retirement obligation accretion                 18,152 17,463 26,947
General and administrative expenses                 78,649 79,424 71,714
Derivative (gain) loss                 8,470 13,954 (1,896)
Total costs and expenses                 703,458 591,772 510,621
Operating income                 76,984 67,431 187,278
Earnings of affiliates                 45,209 66,195 92,533
Interest expense:                      
Incurred                 85,531 63,268 52,393
Capitalized                 (9,950) (13,274) (9,877)
Loss on extinguishment of debt                 128   22,694
Other income                 9,074 215 84
Income before income tax expense                 55,558 83,847 214,685
Income tax expense                 4,236 11,863 41,868
Net income                 51,322 71,984 172,817
Guarantor Subsidiaries
                      
Condensed Financial Statements Captions [Line Items]                      
Revenues                 203,646 215,288 273,148
Operating costs and expenses:                      
Lease operating expenses                 18,328 22,679 37,041
Gathering and transportation                 3,763 3,175 4,244
Depreciation, depletion and amortization                 105,817 82,370 84,275
Asset retirement obligation accretion                 2,766 2,592 2,824
General and administrative expenses                 3,225 2,593 2,582
Total costs and expenses                 133,899 113,409 130,966
Operating income                 69,747 101,879 142,182
Interest expense:                      
Incurred                 108    
Capitalized                 (108)    
Income before income tax expense                 69,747 101,879 142,182
Income tax expense                 24,538 35,684 49,649
Net income                 45,209 66,195 92,533
Eliminations
                      
Operating costs and expenses:                      
Earnings of affiliates                 (45,209) (66,195) (92,533)
Interest expense:                      
Income before income tax expense                 (45,209) (66,195) (92,533)
Net income                 $ (45,209) $ (66,195) $ (92,533)
[1] In January 2014, we identified that we had been receiving an erroneous million British thermal unit (“MMBtu”) conversion factor from a third party that had the effect of understating natural gas production at our Viosca Knoll 783 field (Tahoe).  The incorrect conversion factor had been used on all natural gas production from the field since we acquired it in 2011.  The use of the incorrect conversion factor did not affect revenues, operating cash flows or royalty payments to the federal government but did impact reported natural gas production and the calculation of depletion expense.  We performed an analysis of the information, assessing both quantitative and qualitative factors, and determined that the impact on our net income reported for prior annual periods, as well as the impact to our earnings trend, was not material to 2011 and 2012 results, thus the adjustment was recognized in the fourth quarter of 2013.  The fourth quarter of 2013 reflects a one-time increase in natural gas production volumes of 2.6 Bcf (with no corresponding increase in revenue) by using the correct conversion factor for the annual periods of 2011 and 2012, and the first three quarters of 2013, which increased DD&A by $7.1 million and decreased net income by $4.6 million.