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Business Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Segment Reporting [Abstract] |
Summarized Financial Information Concerning Segments | Summarized financial information concerning the Company’s segments is shown in the following table (in thousands):
| Exploration and Production(1) |  | Drilling and Oil Field Services(2) |  | Midstream Services(3) |  | All Other(4) |  | Consolidated Total
Year Ended December 31, 2015 |  |  |  |  |  |  |  |  |
Revenues | $ | 707,446 |  |  | $ | 67,358 |  |  | $ | 81,083 |  |  | $ | 5,342 |  |  | $ | 861,229 |
Inter-segment revenue | (12 | ) |  | (45,234 | ) |  | (47,274 | ) |  | — |  |  | (92,520 | )
Total revenues | $ | 707,434 |  |  | $ | 22,124 |  |  | $ | 33,809 |  |  | $ | 5,342 |  |  | $ | 768,709 |
Loss from operations | $ | (4,461,907 | ) |  | $ | (59,999 | ) |  | $ | (15,218 | ) |  | $ | (105,554 | ) |  | $ | (4,642,678 | )
Interest expense, net | (42 | ) |  | — |  |  | — |  |  | (321,379 | ) |  | (321,421 | )
Gain on extinguishment of debt | — |  |  | — |  |  | — |  |  | 641,131 |  |  | 641,131 |
Other income, net | 1,368 |  |  | 13 |  |  | 253 |  |  | 406 |  |  | 2,040 |
Loss before income taxes | $ | (4,460,581 | ) |  | $ | (59,986 | ) |  | $ | (14,965 | ) |  | $ | 214,604 |  |  | $ | (4,320,928 | )
Capital expenditures(5) | $ | 656,022 |  |  | $ | 4,632 |  |  | $ | 21,556 |  |  | $ | 19,405 |  |  | $ | 701,615 |
Depreciation, depletion, amortization and accretion | $ | 324,471 |  |  | $ | 17,438 |  |  | $ | 11,742 |  |  | $ | 18,121 |  |  | $ | 371,772 |
At December 31, 2015 |  |  |  |  |  |  |  |  |
Total assets | $ | 1,959,975 |  |  | $ | 27,621 |  |  | $ | 254,212 |  |  | $ | 749,347 |  |  | $ | 2,991,155 |
Year Ended December 31, 2014 |  |  |  |  |  |  |  |  |
Revenues | $ | 1,423,073 |  |  | $ | 192,944 |  |  | $ | 142,987 |  |  | $ | 4,376 |  |  | $ | 1,763,380 |
Inter-segment revenue | (173 | ) |  | (116,856 | ) |  | (87,593 | ) |  | — |  |  | (204,622 | )
Total revenues | $ | 1,422,900 |  |  | $ | 76,088 |  |  | $ | 55,394 |  |  | $ | 4,376 |  |  | $ | 1,558,758 |
Income (loss) from operations | $ | 713,716 |  |  | $ | (37,564 | ) |  | $ | (9,094 | ) |  | $ | (76,834 | ) |  | $ | 590,224 |
Interest income (expense), net | 100 |  |  | — |  |  | — |  |  | (244,209 | ) |  | (244,109 | )
Other (expense) income, net | (423 | ) |  | (541 | ) |  | 9 |  |  | 4,445 |  |  | 3,490 |
Income (loss) before income taxes | $ | 713,393 |  |  | $ | (38,105 | ) |  | $ | (9,085 | ) |  | $ | (316,598 | ) |  | $ | 349,605 |
Capital expenditures(5) | $ | 1,508,100 |  |  | $ | 18,385 |  |  | $ | 44,606 |  |  | $ | 37,798 |  |  | $ | 1,608,889 |
Depreciation, depletion, amortization and accretion | $ | 443,573 |  |  | $ | 29,105 |  |  | $ | 10,085 |  |  | $ | 20,260 |  |  | $ | 503,023 |
At December 31, 2014 |  |  |  |  |  |  |  |  |
Total assets | $ | 6,273,802 |  |  | $ | 115,083 |  |  | $ | 219,691 |  |  | $ | 650,649 |  |  | $ | 7,259,225 |
Year Ended December 31, 2013 |  |  |  |  |  |  |  |  |
Revenues | $ | 1,834,480 |  |  | $ | 187,456 |  |  | $ | 179,989 |  |  | $ | 3,127 |  |  | $ | 2,205,052 |
Inter-segment revenue | (320 | ) |  | (120,815 | ) |  | (100,529 | ) |  | — |  |  | (221,664 | )
Total revenues | $ | 1,834,160 |  |  | $ | 66,641 |  |  | $ | 79,460 |  |  | $ | 3,127 |  |  | $ | 1,983,388 |
Income (loss) from operations | $ | 62,509 |  |  | $ | (40,155 | ) |  | $ | (21,567 | ) |  | $ | (169,788 | ) |  | $ | (169,001 | )
Interest income (expense), net | 1,168 |  |  | — |  |  | (209 | ) |  | (271,193 | ) |  | (270,234 | )
Loss on extinguishment of debt | — |  |  | — |  |  | — |  |  | (82,005 | ) |  | (82,005 | )
Other income (expense), net | 5,487 |  |  | — |  |  | (3,222 | ) |  | 10,180 |  |  | 12,445 |
Income (loss) before income taxes | $ | 69,164 |  |  | $ | (40,155 | ) |  | $ | (24,998 | ) |  | $ | (512,806 | ) |  | $ | (508,795 | )
Capital expenditures(5) | $ | 1,319,012 |  |  | $ | 7,125 |  |  | $ | 55,706 |  |  | $ | 42,040 |  |  | $ | 1,423,883 |
Depreciation, depletion, amortization and accretion | $ | 605,242 |  |  | $ | 33,291 |  |  | $ | 7,972 |  |  | $ | 20,140 |  |  | $ | 666,645 |
____________________
(1) | (Loss) income from operations includes full cost ceiling limitation impairments of $4.5 billion and $164.8 million for the years ended December 31, 2015 and 2014, respectively, a loss on the sale of the Permian Properties of $398.9 million for the year ended December 31, 2013 and the Company’s (gain) loss on derivative contracts, including net cash payments upon settlement, for the years ended December 31, 2015, 2014 and 2013. See Note 13 for discussion of derivative contracts.
(2) | For the years ended December 31, 2015, 2014 and 2013, (loss) income from operations includes impairments of $37.6 million, $27.4 million, and $11.1 million, respectively, on certain drilling assets.
(3) | For the years ended December 31, 2015, 2014 and 2013, (loss) income from operations includes impairments of other midstream assets and the Company’s gas treating plants in west Texas of $7.1 million, $0.6 million and $3.9 million, respectively.
(4) | (Loss) income from operations for the year ended December 31, 2015 includes an impairment of $15.4 million on property located in downtown Oklahoma City, Oklahoma and $0.7 million on gathering and compression equipment. See Note 7. For the year ended December 31, 2013, (loss) income from operations includes a $2.9 million impairment of a corporate asset and an $8.3 million impairment of the Company’s CO 2 compression facilities.
(5) | On an accrual basis and exclusive of acquisitions.
Major Customers | Major Customers. For the years ended December 31, 2015, 2014 and 2013, the Company had sales exceeding 10% of total revenues to the following oil and natural gas purchasers (in thousands):
| 2015
| Sales |  | % of Revenue
Plains Marketing, L.P. | $ | 318,018 |  |  | 41.4 | %
Targa Pipeline Mid-Continent West OK LLC | $ | 231,649 |  |  | 30.1 | %
| 2014
| Sales |  | % of Revenue
Plains Marketing, L.P. | $ | 597,117 |  |  | 38.3 | %
Targa Pipeline Mid-Continent West OK LLC | $ | 333,027 |  |  | 21.4 | %
| 2013
| Sales |  | % of Revenue
Plains Marketing, L.P. | $ | 491,258 |  |  | 24.8 | %
Shell Trading (US) Company | $ | 347,422 |  |  | 17.5 | %
Targa Pipeline Mid-Continent West OK LLC | $ | 211,838 |  |  | 10.7 | %

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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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