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Goodwill and intangible assets (Tables) | 3 Months Ended
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Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill from December 31, 2015 to March 31, 2016, were as follows (in thousands):
| Drilling & Subsea |  | Completions |  | Production & Infrastructure |  | Total
Goodwill Balance at December 31, 2015 | $ | 334,595 |  |  | $ | 316,914 |  |  | $ | 17,527 |  |  | $ | 669,036 |
Impact of non-U.S. local currency translation | 326 |  |  | 1,619 |  |  | 209 |  |  | $ | 2,154 |
Goodwill Balance at March 31, 2016 | $ | 334,921 |  |  | $ | 318,533 |  |  | $ | 17,736 |  |  | $ | 671,190 |
Summary of Intangible Assets | Intangible assets consisted of the following as of March 31, 2016 and December 31, 2015, respectively (in thousands):
| March 31, 2016
| Gross carrying amount |  | Accumulated amortization |  | Net amortizable intangibles |  | Amortization period (in years)
Customer relationships | $ | 280,381 |  |  | $ | (106,206 | ) |  | $ | 174,175 |  |  | 4-15
Patents and technology | 34,359 |  |  | (10,739 | ) |  | 23,620 |  |  | 5-17
Non-compete agreements | 7,295 |  |  | (6,431 | ) |  | 864 |  |  | 3-6
Trade names | 45,601 |  |  | (16,557 | ) |  | 29,044 |  |  | 10-15
Distributor relationships | 22,160 |  |  | (14,126 | ) |  | 8,034 |  |  | 8-15
Trademark | 5,230 |  |  | — |  |  | 5,230 |  |  | Indefinite
Intangible Assets Total | $ | 395,026 |  |  | $ | (154,059 | ) |  | $ | 240,967 |  |  |
| 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 |  |  |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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