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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2014
Goodwill by Operating Segment | Goodwill — Goodwill by operating segment as of June 30, 2014 and changes for the six months then ended are as follows (in thousands):
|  | Contract Drilling |  |  | Pressure Pumping |  |  | Total |
Balance December 31, 2013 |  | $ | 86,234 |  |  | $ | 67,575 |  |  | $ | 153,809 |
Changes to goodwill |  |  | — |  |  |  | 11,655 |  |  |  | 11,655 |
Balance June 30, 2014 |  | $ | 86,234 |  |  | $ | 79,230 |  |  | $ | 165,464 |
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 June 30, 2014 and December 31, 2013 (in thousands):
|  | June 30, 2014 |  |  | December 31, 2013 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Customer relationships |  | $ | 25,500 |  |  | $ | (13,661 | ) |  | $ | 11,839 |  |  | $ | 25,500 |  |  | $ | (11,839 | ) |  | $ | 13,661 |

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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 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: 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 + 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=14024403&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=14024403&loc=d3e13854-109267 + Details
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