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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill by Operating Segment | Goodwill — Goodwill by operating segment as of September 30, 2019 and changes for the nine months then ended are as follows (in thousands):
| Contract |  |  | Other |  |  |  |  |
| Drilling |  |  | Operations |  |  | Total |
Balance at beginning of period | $ | 395,060 |  |  | $ | 15,696 |  |  | $ | 410,756 |
Changes to goodwill |  | — |  |  |  | 2,104 |  |  |  | 2,104 |
Impairment |  | — |  |  |  | (17,800 | ) |  |  | (17,800 | )
Balance at end of period | $ | 395,060 |  |  | $ | - |  |  | $ | 395,060 |
Gross Carrying Amount and Accumulated Amortization of Intangible Assets | Intangible Assets — The following table presents the gross carrying amount and accumulated amortization of the intangible assets as of September 30, 2019 and December 31, 2018 (in thousands):
| September 30, 2019 |  |  | December 31, 2018 |
| Gross |  |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |  |  | Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships | $ | 28,000 |  |  |  | (17,463 | ) |  |  | 10,537 |  |  | $ | 28,000 |  |  | $ | (10,719 | ) |  | $ | 17,281 |
Developed technology |  | 55,772 |  |  |  | (12,355 | ) |  |  | 43,417 |  |  |  | 55,772 |  |  |  | (6,533 | ) |  |  | 49,239 |
Favorable drilling contracts |  | — |  |  |  | — |  |  |  | — |  |  |  | 22,500 |  |  |  | (22,500 | ) |  |  | — |
Internal use software |  | 482 |  |  |  | (188 | ) |  |  | 294 |  |  |  | 482 |  |  |  | (118 | ) |  |  | 364 |
|  | 84,254 |  |  |  | (30,006 | ) |  |  | 54,248 |  |  | $ | 106,754 |  |  | $ | (39,870 | ) |  | $ | 66,884 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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