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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill by Operating Segment | Goodwill — Goodwill by operating segment as of September 30, 2018 and changes for the nine months then ended are as follows (in thousands):
| Contract |  |  | Pressure |  |  | Directional |  |  | Oilfield |  |  |  |  |
| Drilling |  |  | Pumping |  |  | Drilling |  |  | Rentals |  |  | Total |
Balance at beginning of period | $ | 395,060 |  |  |  | 121,444 |  |  | $ | 88,685 |  |  |  | 6,284 |  |  | $ | 611,473 |
Changes to goodwill |  | — |  |  |  | — |  |  |  | 1,000 |  |  |  | — |  |  |  | 1,000 |
Balance at end of period | $ | 395,060 |  |  | $ | 121,444 |  |  | $ | 89,685 |  |  | $ | 6,284 |  |  | $ | 612,473 |
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, 2018 and December 31, 2017 (in thousands):
| September 30, 2018 |  |  | December 31, 2017 |
| Gross |  |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |  |  | Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships | $ | 26,200 |  |  | $ | (8,493 | ) |  |  | 17,707 |  |  | $ | 26,200 |  |  | $ | (1,943 | ) |  | $ | 24,257 |
Developed technology |  | 55,772 |  |  |  | (5,139 | ) |  |  | 50,633 |  |  |  | 48,000 |  |  |  | (1,137 | ) |  |  | 46,863 |
Favorable drilling contracts |  | 22,500 |  |  |  | (22,336 | ) |  |  | 164 |  |  |  | 22,500 |  |  |  | (18,482 | ) |  |  | 4,018 |
Internal use software |  | 482 |  |  |  | (94 | ) |  |  | 388 |  |  |  | 482 |  |  |  | (21 | ) |  |  | 461 |
| $ | 104,954 |  |  | $ | (36,062 | ) |  | $ | 68,892 |  |  | $ | 97,182 |  |  | $ | (21,583 | ) |  | $ | 75,599 |

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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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