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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2012
Goodwill by Operating Segment | Goodwill — Goodwill by operating segment as of December 31, 2012 and 2011 and changes for the years then ended are as follows (in thousands):
|  | Contract Drilling |  |  | Pressure Pumping |  |  | Total |
Balance December 31, 2010 |  | $ | 86,234 |  |  | $ | 67,575 |  |  | $ | 153,809 |
Changes to goodwill |  |  | — |  |  |  | — |  |  |  | — |
Balance December 31, 2011 |  |  | 86,234 |  |  |  | 67,575 |  |  |  | 153,809 |
Changes to goodwill |  |  | — |  |  |  | — |  |  |  | — |
Balance December 31, 2012 |  | $ | 86,234 |  |  | $ | 67,575 |  |  | $ | 153,809 |
Gross Carrying Amount and Accumulated Amortization of Intangible Assets | The following table presents the gross carrying amount and accumulated amortization of intangible assets as of December 31, 2012 and 2011 (in thousands):
|  | 2012 |  |  | 2011 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Non-compete agreement |  | $ | 1,400 |  |  | $ | (1,050 | ) |  | $ | 350 |  |  | $ | 1,400 |  |  | $ | (583 | ) |  | $ | 817 |
Customer relationships |  |  | 25,500 |  |  |  | (8,196 | ) |  |  | 17,304 |  |  |  | 25,500 |  |  |  | (4,553 | ) |  |  | 20,947 |
Total intangible assets |  | $ | 26,900 |  |  | $ | (9,246 | ) |  | $ | 17,654 |  |  | $ | 26,900 |  |  | $ | (5,136 | ) |  | $ | 21,764 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph c -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 47 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -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. + Details
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