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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill by Operating Segment | Goodwill — All of the Company’s goodwill at both March 31, 2016 and December 31, 2015 related to the contract drilling operating segment. Goodwill as of March 31, 2016 and changes for the three months then ended are as follows (in thousands):
| Three Months Ended |
| March 31, 2016 |
Balance at beginning of period | $ | 86,234 |
Changes to goodwill | — |
Balance at end of period | $ | 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 March 31, 2016 and December 31, 2015 (in thousands):
| March 31, 2016 |  |  | December 31, 2015 |
| Gross |  |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |  |  | Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships | $ | 25,500 |  |  | $ | (20,036 | ) |  | $ | 5,464 |  |  | $ | 25,500 |  |  | $ | (19,125 | ) |  | $ | 6,375 |

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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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