Annual report pursuant to Section 13 and 15(d)

Supplemental Guarantor Information - Condensed Consolidating Statement of Operations (Details)

v3.8.0.1
Supplemental Guarantor Information - Condensed Consolidating Statement of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Income Statements Captions [Line Items]                      
Revenues $ 129,099 $ 110,281 $ 123,323 $ 124,393 $ 115,213 $ 107,403 $ 99,655 $ 77,715 $ 487,096 $ 399,986 $ 507,265
Operating costs and expenses:                      
Lease operating expenses                 143,738 152,399 192,765
Production taxes                 1,740 1,889 3,002
Gathering and transportation                 20,441 22,928 17,157
Depreciation, depletion and amortization                 138,510 194,038 373,368
Asset retirement obligations accretion                 17,172 17,571 20,703
Ceiling test write-down of oil and natural gas properties           57,900 104,600 116,600 0 279,063 987,238
General and administrative expenses                 59,744 59,740 73,110
Derivative (gain) loss                 (4,199) 2,926 (14,375)
Total costs and expenses                 377,146 730,554 1,652,968
Operating income (loss) 33,166 15,700 32,888 28,196 21,319 [1] (58,276) [1] (126,997) [1] (166,614) [1] 109,950 (330,568) (1,145,703)
Interest expense:                      
Incurred                 45,836 92,791 104,592
Capitalized                 0 (520) (7,256)
Gain on exchange of debt           123,900     7,811 123,923  
Other (income) expense, net                 4,812 (6,520) 4,663
Income (loss) before income tax benefit                 67,113 (292,396) (1,247,702)
Income tax expense (benefit)                 (12,569) (43,376) (202,984)
Net income (loss) $ 23,365 $ (1,297) $ 33,315 $ 24,299 $ 16,483 [1] $ 45,928 [1] $ (120,922) [1] $ (190,509) [1] 79,682 (249,020) (1,044,718)
Parent Company                      
Condensed Income Statements Captions [Line Items]                      
Revenues                 231,396 161,063 290,212
Operating costs and expenses:                      
Lease operating expenses                 79,695 84,415 126,189
Production taxes                 1,740 1,889 3,002
Gathering and transportation                 9,781 9,795 9,209
Depreciation, depletion and amortization                 73,962 73,268 201,154
Asset retirement obligations accretion                 7,416 8,165 11,587
Ceiling test write-down of oil and natural gas properties                   28,305 616,947
General and administrative expenses                 28,170 24,817 39,009
Derivative (gain) loss                 (4,199) 2,926 (14,375)
Total costs and expenses                 196,565 233,580 992,722
Operating income (loss)                 34,831 (72,517) (702,510)
Earnings (loss) of affiliates                 61,444 (109,853) (464,931)
Interest expense:                      
Incurred                 45,836 92,607 101,542
Capitalized                   (336) (4,206)
Gain on exchange of debt                 7,811 123,923  
Other (income) expense, net                 4,812 (6,520) 4,663
Income (loss) before income tax benefit                 53,438 (144,198) (1,269,440)
Income tax expense (benefit)                 (29,092) (43,720) (77,133)
Net income (loss)                 82,530 (100,478) (1,192,307)
Guarantor Subsidiaries                      
Condensed Income Statements Captions [Line Items]                      
Revenues                 255,700 238,923 217,053
Operating costs and expenses:                      
Lease operating expenses                 64,043 67,984 66,576
Gathering and transportation                 10,660 13,133 7,948
Depreciation, depletion and amortization                 61,700 112,277 172,214
Asset retirement obligations accretion                 9,756 9,406 9,116
Ceiling test write-down of oil and natural gas properties                   110,709 517,880
General and administrative expenses                 31,574 34,923 34,101
Total costs and expenses                 177,733 348,432 807,835
Operating income (loss)                 77,967 (109,509) (590,782)
Interest expense:                      
Incurred                   184 3,050
Capitalized                   (184) (3,050)
Income (loss) before income tax benefit                 77,967 (109,509) (590,782)
Income tax expense (benefit)                 16,523 344 (125,851)
Net income (loss)                 61,444 (109,853) (464,931)
Eliminations                      
Operating costs and expenses:                      
Depreciation, depletion and amortization                 2,848 8,493  
Ceiling test write-down of oil and natural gas properties                   140,049 (147,589)
Total costs and expenses                 2,848 148,542 (147,589)
Operating income (loss)                 (2,848) (148,542) 147,589
Earnings (loss) of affiliates                 (61,444) 109,853 464,931
Interest expense:                      
Income (loss) before income tax benefit                 (64,292) (38,689) 612,520
Net income (loss)                 $ (64,292) $ (38,689) $ 612,520
[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. See Note 1 and Note 2 for additional information.