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Business Segment Information | 12 Months Ended
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Dec. 31, 2015
Segment Reporting [Abstract] |
Business Segment Information | Business Segment Information During the years ended December 31, 2015, 2014 and 2013, the Company had three reportable business segments: exploration and production, drilling and oilfield services and midstream services. These segments represent the Company’s three main business units, each offering different products and services. The exploration and production segment is engaged in the exploration and production of oil and natural gas properties and includes the activities of the Royalty Trusts. The drilling and oilfield services segment is engaged in the contract drilling of oil and natural gas wells and provides various oilfield services. The midstream services segment is engaged in the purchasing, gathering, treating and selling of natural gas and coordinates the delivery of electricity to the Company’s exploration and production operations in the Mid-Continent. The All Other column in the tables below includes items not related to the Company’s reportable segments, including the Company’s corporate operations. As discussed in Note 22, the Company discontinued the substantial majority of activity within its drilling and oilfield services segment in January 2016. The Company is currently evaluating the impact of this event on its segment reporting for periods within the year ending December 31, 2016. Management evaluates the performance of the Company’s business segments based on (loss) income from operations. 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. 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 | %
Plains Marketing, L.P., Targa Pipeline Mid-Continent West OK LLC (formerly Atlas Pipeline Mid-Continent West OK LLC) and Shell Trading (US) Company are purchasers of oil, natural gas and NGLs sold by the Company’s exploration and production segment.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8981-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8971-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8595-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8984-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9031-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8538-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8864-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8924-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 + Details
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