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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2012
Business Segments - Financial Information | The following tables summarize selected financial information relating to the Company’s business segments (in thousands):
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Contract drilling |  | $ | 1,826,519 |  |  | $ | 1,673,629 |  |  | $ | 1,085,722 |
Pressure pumping |  |  | 841,771 |  |  |  | 845,803 |  |  |  | 350,608 |
Oil and natural gas |  |  | 59,930 |  |  |  | 50,559 |  |  |  | 30,425 |
Total segment revenues |  |  | 2,728,220 |  |  |  | 2,569,991 |  |  |  | 1,466,755 |
Elimination of intercompany revenues(a) |  |  | (4,806 | ) |  |  | (4,048 | ) |  |  | (3,824 | )
Total revenues |  | $ | 2,723,414 |  |  | $ | 2,565,943 |  |  | $ | 1,462,931 |
Income from continuing operations before income taxes: |  |  |  |  |  |  |  |  |  |  |  |
Contract drilling |  | $ | 349,393 |  |  | $ | 346,083 |  |  | $ | 140,483 |
Pressure pumping |  |  | 132,795 |  |  |  | 193,440 |  |  |  | 62,194 |
Oil and natural gas |  |  | 27,210 |  |  |  | 23,982 |  |  |  | 12,455 |
|  |  | 509,398 |  |  |  | 563,505 |  |  |  | 215,132 |
Corporate and other |  |  | (45,843 | ) |  |  | (42,903 | ) |  |  | (37,019 | )
Net gain on asset disposals(b) |  |  | 33,806 |  |  |  | 4,999 |  |  |  | 22,812 |
Interest income |  |  | 554 |  |  |  | 187 |  |  |  | 1,674 |
Interest expense |  |  | (22,750 | ) |  |  | (15,652 | ) |  |  | (12,772 | )
Other |  |  | 508 |  |  |  | 582 |  |  |  | 927 |
Income from continuing operations before income taxes |  | $ | 475,673 |  |  | $ | 510,718 |  |  | $ | 190,754 |
Identifiable assets: |  |  |  |  |  |  |  |  |  |  |  |
Contract drilling |  | $ | 3,538,289 |  |  | $ | 3,252,116 |  |  | $ | 2,678,250 |
Pressure pumping |  |  | 784,128 |  |  |  | 748,643 |  |  |  | 533,597 |
Oil and natural gas |  |  | 54,188 |  |  |  | 44,990 |  |  |  | 36,508 |
Corporate and other(c) |  |  | 180,306 |  |  |  | 176,152 |  |  |  | 174,676 |
Total assets |  | $ | 4,556,911 |  |  | $ | 4,221,901 |  |  | $ | 3,423,031 |
Depreciation, depletion, amortization and impairment: |  |  |  |  |  |  |  |  |  |  |  |
Contract drilling |  | $ | 390,316 |  |  | $ | 344,312 |  |  | $ | 280,458 |
Pressure pumping |  |  | 111,062 |  |  |  | 73,279 |  |  |  | 40,724 |
Oil and natural gas |  |  | 21,417 |  |  |  | 16,962 |  |  |  | 10,950 |
Corporate and other |  |  | 3,819 |  |  |  | 2,726 |  |  |  | 1,361 |
Total depreciation, depletion, amortization and impairment |  | $ | 526,614 |  |  | $ | 437,279 |  |  | $ | 333,493 |
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Contract drilling |  | $ | 744,949 |  |  | $ | 784,686 |  |  | $ | 655,550 |
Pressure pumping |  |  | 194,117 |  |  |  | 198,061 |  |  |  | 51,064 |
Oil and natural gas |  |  | 29,888 |  |  |  | 22,884 |  |  |  | 23,067 |
Corporate and other |  |  | 5,034 |  |  |  | 5,947 |  |  |  | 8,409 |
Total capital expenditures |  | $ | 973,988 |  |  | $ | 1,011,578 |  |  | $ | 738,090 |
(a) | Includes contract drilling intercompany revenues related to drilling services provided to the oil and natural gas exploration and production segment.
(b) | Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.
(c) | Corporate and other assets primarily include identifiable assets associated with assets held for sale as well as cash on hand, income taxes receivable and certain deferred federal income tax assets.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27, 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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=6534315&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 + Details
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