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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill The changes in the carrying amount of goodwill from December 31, 2018 to March 31, 2019, were as follows (in thousands):
| Drilling & Downhole |  | Completions |  | Production |  | Total
Goodwill Balance at December 31, 2018 | $ | 191,151 |  |  | $ | 259,280 |  |  | $ | 19,216 |  |  | $ | 469,647 |
Purchase accounting adjustments | 427 |  |  | — |  |  | — |  |  | 427 |
Impact of non-U.S. local currency translation | 68 |  |  | 485 |  |  | 47 |  |  | 600 |
Goodwill Balance at March 31, 2019 | $ | 191,646 |  |  | $ | 259,765 |  |  | $ | 19,263 |  |  | $ | 470,674 |
We perform our annual impairment tests of goodwill as of October 1 or when there is an indication an impairment may have occurred. There were no impairments of goodwill during the three months ended March 31, 2019 and 2018. Accumulated impairment losses on goodwill were $535.6 million as of March 31, 2019 and December 31, 2018. Intangible assets Intangible assets consisted of the following as of March 31, 2019 and December 31, 2018, respectively (in thousands):
| March 31, 2019
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Amortizable Intangibles |  | Amortization Period (In Years)
Customer relationships | $ | 337,758 |  |  | $ | (115,819 | ) |  | $ | 221,939 |  |  | 4-15
Patents and technology | 104,384 |  |  | (18,855 | ) |  | 85,529 |  |  | 5-17
Non-compete agreements | 6,259 |  |  | (5,694 | ) |  | 565 |  |  | 3-6
Trade names | 47,560 |  |  | (19,336 | ) |  | 28,224 |  |  | 10-15
Distributor relationships | 22,160 |  |  | (17,918 | ) |  | 4,242 |  |  | 8-15
Trademarks | 10,319 |  |  | (509 | ) |  | 9,810 |  |  | 15 - Indefinite
Intangible Assets Total | $ | 528,440 |  |  | $ | (178,131 | ) |  | $ | 350,309 |  |  |
| December 31, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Amortizable Intangibles |  | Amortization Period (In Years)
Customer relationships | $ | 337,546 |  |  | $ | (110,228 | ) |  | $ | 227,318 |  |  | 4-15
Patents and technology | 104,394 |  |  | (17,148 | ) |  | 87,246 |  |  | 5-17
Non-compete agreements | 6,245 |  |  | (5,600 | ) |  | 645 |  |  | 3-6
Trade names | 47,493 |  |  | (18,107 | ) |  | 29,386 |  |  | 10-15
Distributor relationships | 22,160 |  |  | (17,602 | ) |  | 4,558 |  |  | 8-15
Trademarks | 10,319 |  |  | (424 | ) |  | 9,895 |  |  | 15 - Indefinite
Intangible Assets Total | $ | 528,157 |  |  | $ | (169,109 | ) |  | $ | 359,048 |  |  |
Intangible assets with definite lives are tested for impairment whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. There were no intangible asset impairments during the three months ended March 31, 2019 and 2018.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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