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Business Segments (Tables) | 3 Months Ended
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Mar. 31, 2013
Business Segments - Financial Information | Separate financial data for each of our business segments is provided in the table below (in thousands):
|  | Three Months Ended March 31, |
|  | 2013 |  |  | 2012 |
Revenues: |  |  |  |  |  |  |  |
Contract drilling |  | $ | 420,233 |  |  | $ | 490,703 |
Pressure pumping |  |  | 231,160 |  |  |  | 241,722 |
Oil and natural gas |  |  | 16,785 |  |  |  | 14,717 |
Total segment revenues |  |  | 668,178 |  |  |  | 747,142 |
Elimination of intercompany revenues (a) |  |  | (1,139 | ) |  |  | (1,221 | )
Total revenues |  | $ | 667,039 |  |  | $ | 745,921 |
Income before income taxes: |  |  |  |  |  |  |  |
Contract drilling |  | $ | 72,549 |  |  | $ | 111,771 |
Pressure pumping |  |  | 28,515 |  |  |  | 46,787 |
Oil and natural gas |  |  | 6,241 |  |  |  | 7,518 |
|  |  | 107,305 |  |  |  | 166,076 |
Corporate and other |  |  | (12,248 | ) |  |  | (10,812 | )
Net gain (loss) on asset disposals (b) |  |  | (125 | ) |  |  | 2,400 |
Interest income |  |  | 173 |  |  |  | 54 |
Interest expense |  |  | (6,766 | ) |  |  | (4,582 | )
Other |  |  | 19 |  |  |  | 55 |
Income before income taxes |  | $ | 88,358 |  |  | $ | 153,191 |
|  | March 31, 2013 |  |  | December 31, 2012 |
Identifiable assets: |  |  |  |  |  |  |  |
Contract drilling |  | $ | 3,607,349 |  |  | $ | 3,538,289 |
Pressure pumping |  |  | 802,050 |  |  |  | 784,128 |
Oil and natural gas |  |  | 55,212 |  |  |  | 54,188 |
Corporate and other (c) |  |  | 192,621 |  |  |  | 180,306 |
Total assets |  | $ | 4,657,232 |  |  | $ | 4,556,911 |
(a) |  | Consists of contract drilling intercompany revenues for 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 cash on hand and certain deferred 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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