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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill by Operating Segment | Goodwill — Goodwill by operating segment as of September 30, 2015 and changes for the nine months then ended are as follows (in thousands):
| Contract |  |  | Pressure |  |  |  |  |
| Drilling |  |  | Pumping |  |  | Total |
Balance, December 31, 2014 | $ | 86,234 |  |  | $ | 124,561 |  |  | $ | 210,795 |
Changes to goodwill | — |  |  |  | (124,561 | ) |  |  | (124,561 | )
Balance, September 30, 2015 | $ | 86,234 |  |  | $ | — |  |  | $ | 86,234 |
Gross Carrying Amount and Accumulated Amortization of Customer Relationships | The following table presents the gross carrying amount and accumulated amortization of the customer relationships as of September 30, 2015 and December 31, 2014 (in thousands):
| September 30, 2015 |  |  | December 31, 2014 |
| Gross |  |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |  |  | Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships | $ | 25,500 |  |  | $ | (18,214 | ) |  | $ | 7,286 |  |  | $ | 25,500 |  |  | $ | (15,482 | ) |  | $ | 10,018 |

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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=26713463&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=26713463&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 Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: 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=35741047&loc=d3e13854-109267 + Details
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