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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | 6. Goodwill and Intangible Assets Goodwill — Goodwill by operating segment as of March 31, 2018 and changes for the three 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 |
Goodwill acquired |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance at end of period | $ | 395,060 |  |  | $ | 121,444 |  |  | $ | 88,685 |  |  | $ | 6,284 |  |  | $ | 611,473 |
There were no accumulated impairment losses related to goodwill as of March 31, 2018 or December 31, 2017. Goodwill is evaluated at least annually as of December 31, or when circumstances require, to determine if the fair value of recorded goodwill has decreased below its carrying value. For impairment testing purposes, goodwill is evaluated at the reporting unit level. The Company’s reporting units for impairment testing are its operating segments. The Company determines whether it is more likely than not that the fair value of a reporting unit is less than its carrying value after considering qualitative, market and other factors, and if this is the case, any necessary goodwill impairment is determined using a quantitative impairment test. From time to time, the Company may perform quantitative testing for goodwill impairment in lieu of performing the qualitative assessment. If the resulting fair value of goodwill is less than the carrying value of goodwill, an impairment loss would be recognized for the amount of the shortfall. Intangible Assets — The following table presents the gross carrying amount and accumulated amortization of the intangible assets as of March 31, 2018 and December 31, 2017 (in thousands):
| March 31, 2018 |  |  | December 31, 2017 |
| Gross |  |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |  |  | Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Customer relationships | $ | 26,200 |  |  | $ | (4,126 | ) |  |  | 22,074 |  |  | $ | 26,200 |  |  | $ | (1,943 | ) |  | $ | 24,257 |
Developed technology |  | 55,772 |  |  |  | (2,274 | ) |  |  | 53,498 |  |  |  | 48,000 |  |  |  | (1,137 | ) |  |  | 46,863 |
Favorable drilling contracts |  | 22,500 |  |  |  | (20,583 | ) |  |  | 1,917 |  |  |  | 22,500 |  |  |  | (18,482 | ) |  |  | 4,018 |
Internal use software |  | 482 |  |  |  | (46 | ) |  |  | 436 |  |  |  | 482 |  |  |  | (21 | ) |  |  | 461 |
| $ | 104,954 |  |  | $ | (27,029 | ) |  | $ | 77,925 |  |  | $ | 97,182 |  |  | $ | (21,583 | ) |  | $ | 75,599 |
Amortization expense on intangible assets of approximately $5.4 million and $911,000 was recorded in the three months ended March 31, 2018 and 2017, respectively.

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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