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Goodwill and intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill from January 1, 2015 to December 31, 2016, were as follows (in thousands):
| Drilling & Subsea | Completions | Production & Infrastructure | Total
| 2016 | 2015 | 2016 | 2015 | 2016 | 2015 | 2016 | 2015
Goodwill Balance at January 1, net | $ | 334,595 |  | $ | 472,891 |  | $ | 316,914 |  | $ | 307,448 |  | $ | 17,527 |  | $ | 18,142 |  | $ | 669,036 |  | $ | 798,481 |
Acquisitions, net of dispositions | — |  | — |  | — |  | 13,977 |  | — |  | — |  | — |  | 13,977 |
Impairment | — |  | (123,200 | ) | — |  | — |  | — |  | — |  | — |  | (123,200 | )
Impact of non-U.S. local currency translation | (17,189 | ) | (15,096 | ) | 779 |  | (4,511 | ) | 117 |  | (615 | ) | (16,293 | ) | (20,222 | )
Goodwill Balance at December 31, net | $ | 317,406 |  | $ | 334,595 |  | $ | 317,693 |  | $ | 316,914 |  | $ | 17,644 |  | $ | 17,527 |  | $ | 652,743 |  | $ | 669,036 |
Summary of Intangible Assets | At December 31, 2016 and 2015, intangible assets consisted of the following, respectively (in thousands):
| December 31, 2016
| Gross carrying amount |  | Accumulated amortization |  | Net amortizable intangibles |  | Amortization period (in years)
Customer relationships | $ | 270,586 |  |  | $ | (115,381 | ) |  | $ | 155,205 |  |  | 4-15
Patents and technology | 33,936 |  |  | (12,225 | ) |  | 21,711 |  |  | 5-17
Non-compete agreements | 6,230 |  |  | (5,594 | ) |  | 636 |  |  | 3-6
Trade names | 44,494 |  |  | (17,944 | ) |  | 26,550 |  |  | 10-15
Distributor relationships | 22,160 |  |  | (15,074 | ) |  | 7,086 |  |  | 8-15
Trademark | 5,230 |  |  | — |  |  | 5,230 |  |  | Indefinite
Intangible Assets Total | $ | 382,636 |  |  | $ | (166,218 | ) |  | $ | 216,418 |  |  |
| December 31, 2015
| Gross carrying amount |  | Accumulated amortization |  | Net amortizable intangibles |  | Amortization period (in years)
Customer relationships | $ | 280,297 |  |  | $ | (101,636 | ) |  | $ | 178,661 |  |  | 4-15
Patents and technology | 34,140 |  |  | (10,264 | ) |  | 23,876 |  |  | 5-17
Non-compete agreements | 7,269 |  |  | (6,292 | ) |  | 977 |  |  | 3-6
Trade names | 45,446 |  |  | (15,890 | ) |  | 29,556 |  |  | 10-15
Distributor relationships | 22,160 |  |  | (13,810 | ) |  | 8,350 |  |  | 8-15
Trademark | 5,230 |  |  | — |  |  | 5,230 |  |  | Indefinite
Intangible Assets Total | $ | 394,542 |  |  | $ | (147,892 | ) |  | $ | 246,650 |  |  |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The total weighted average amortization period is 14 years and the estimated future amortization expense for the next five years is as follows (in thousands):
Year ending December 31, |  |
2017 |  | $ | 26,647 |
2018 |  | 26,556 |
2019 |  | 26,207 |
2020 |  | 24,295 |
2021 |  | 23,730 |

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