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Goodwill and intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill from January 1, 2012 to December 31, 2013, were as follows (in thousands):
| Drilling & Subsea |  | Production & Infrastructure |  | Total
| 2013 | 2012 |  | 2013 | 2012 |  | 2013 | 2012
Goodwill Balance at January 1, net | $ | 616,520 |  | $ | 523,019 |  |  | $ | 79,279 |  | $ | 77,808 |  |  | $ | 695,799 |  | $ | 600,827 |
Acquisition | 100,257 |  | 85,092 |  |  | — |  | — |  |  | 100,257 |  | 85,092 |
Purchase accounting adjustment | 97 |  | — |  |  | — |  | 1,379 |  |  | 97 |  | 1,379 |
Impact of non-U.S. local currency translation | 6,481 |  | 8,409 |  |  | (316 | ) | 92 |  |  | 6,165 |  | 8,501 |
Goodwill Balance at December 31, net | $ | 723,355 |  | $ | 616,520 |  |  | $ | 78,963 |  | $ | 79,279 |  |  | $ | 802,318 |  | $ | 695,799 |
Summary of Intangible Assets | At December 31, 2013 and 2012, intangible assets consisted of the following, respectively (in thousands):
| December 31, 2013
| Gross carrying amount |  | Accumulated amortization |  | Net amortizable intangibles |  | Amortization period (in years)
Customer relationships | $ | 283,171 |  |  | $ | (67,435 | ) |  | $ | 215,736 |  |  | 4-15
Patents and technology | 33,843 |  |  | (6,510 | ) |  | 27,333 |  |  | 5-17
Non-compete agreements | 6,577 |  |  | (5,108 | ) |  | 1,469 |  |  | 3-6
Trade names | 46,654 |  |  | (11,948 | ) |  | 34,706 |  |  | 10-15
Distributor relationships | 22,160 |  |  | (11,282 | ) |  | 10,878 |  |  | 8-15
Trademark | 5,230 |  |  | — |  |  | 5,230 |  |  | Indefinite
Intangible Assets Total | $ | 397,635 |  |  | $ | (102,283 | ) |  | $ | 295,352 |  |  |
| December 31, 2012
| Gross carrying amount |  | Accumulated amortization |  | Net amortizable intangibles |  | Amortization period (in years)
Customer relationships | $ | 241,358 |  |  | $ | (49,766 | ) |  | $ | 191,592 |  |  | 4-15
Patents and technology | 19,780 |  |  | (4,360 | ) |  | 15,420 |  |  | 5-17
Non-compete agreements | 5,880 |  |  | (4,420 | ) |  | 1,460 |  |  | 3-6
Trade names | 40,255 |  |  | (8,680 | ) |  | 31,575 |  |  | 10-15
Distributor relationships | 22,160 |  |  | (10,018 | ) |  | 12,142 |  |  | 8-15
Trademark | 5,230 |  |  | — |  |  | 5,230 |  |  | Indefinite
Intangible Assets Total | $ | 334,663 |  |  | $ | (77,244 | ) |  | $ | 257,419 |  |  |
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, |  |
2014 |  | $ | 26,515 |
2015 |  | 26,455 |
2016 |  | 25,772 |
2017 |  | 25,426 |
2018 |  | 25,336 |

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