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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill by Operating Segment | Goodwill — Goodwill by operating segment as of December 31, 2018 and 2017 and changes for the years then ended are as follows (in thousands):
|  | Contract |  |  | Pressure |  |  | Directional |  |  | Other |  |  |  |  |
|  | Drilling |  |  | Pumping |  |  | Drilling |  |  | Operations |  |  | Total |
Balance December 31, 2016 |  | $ | 86,234 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 86,234 |
Goodwill acquired |  |  | 308,826 |  |  |  | 121,444 |  |  |  | 88,685 |  |  |  | 6,284 |  |  |  | 525,239 |
Balance December 31, 2017 |  |  | 395,060 |  |  |  | 121,444 |  |  |  | 88,685 |  |  |  | 6,284 |  |  |  | 611,473 |
Goodwill acquired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 9,412 |  |  |  | 9,412 |
Measurement period adjustment |  |  | — |  |  |  | — |  |  |  | 1,000 |  |  |  | — |  |  |  | 1,000 |
Impairment |  |  | — |  |  |  | (121,444 | ) |  |  | (89,685 | ) |  |  | — |  |  |  | (211,129 | )
Balance December 31, 2018 |  | $ | 395,060 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,696 |  |  | $ | 410,756 |
Summary of Segment and Weighted Average Useful Life of Intangible Assets | The following table identifies the segment and weighted average useful life of each of the Company’s intangible assets:
|  |  |  | Weighted Average
|  | Segment |  | Useful Life
|  |  |  | (in years)
Customer relationships |  | Directional drilling |  | 3.00
Customer relationships |  | Other operations |  | 7.00
Developed technology |  | Directional drilling |  | 10.00
Favorable drilling contracts |  | Contract drilling |  | 0.83
Internal use software |  | Directional drilling |  | 5.00
Gross Carrying Amount and Accumulated Amortization of Intangible Assets | The gross carrying amount and accumulated amortization of intangible assets as of December 31, 2018 and 2017 are as follows (in thousands):
|  | 2018 |  |  | 2017 |
|  | Gross Carrying |  |  | Accumulated |  |  | Net Carrying |  |  | Gross Carrying |  |  | Accumulated |  |  | Net Carrying |
|  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships |  | $ | 28,000 |  |  | $ | (10,719 | ) |  | $ | 17,281 |  |  | $ | 26,200 |  |  | $ | (1,943 | ) |  | $ | 24,257 |
Developed technology |  |  | 55,772 |  |  |  | (6,533 | ) |  |  | 49,239 |  |  |  | 48,000 |  |  |  | (1,137 | ) |  |  | 46,863 |
Favorable drilling contracts |  |  | 22,500 |  |  |  | (22,500 | ) |  |  | — |  |  |  | 22,500 |  |  |  | (18,482 | ) |  |  | 4,018 |
Internal use software |  |  | 482 |  |  |  | (118 | ) |  |  | 364 |  |  |  | 482 |  |  |  | (21 | ) |  |  | 461 |
|  | $ | 106,754 |  |  | $ | (39,870 | ) |  | $ | 66,884 |  |  | $ | 97,182 |  |  | $ | (21,583 | ) |  | $ | 75,599 |
Remaining Amortization Expense Associated with Finite-Lived Intangible Assets | The remaining amortization expense associated with finite-lived intangible assets is expected to be as follows (in thousands):
Year ending December 31, |  |  |  |
2019 |  | $ | 14,664 |
2020 |  |  | 12,721 |
2021 |  |  | 5,931 |
2022 |  |  | 5,909 |
2023 |  |  | 5,834 |
Thereafter |  |  | 21,825 |
Total |  | $ | 66,884 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: 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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