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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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May 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |
Adjustments to goodwill | Adjustments to goodwill for the fiscal year ended May 31, 2014 and May 31, 2013 are as follows (in thousands):
| Total
Balance, May 31, 2012 | $ | 309,091 |
Goodwill recognized from Vortex business combination | 29,519 |
Goodwill recognized from Microsulis asset acquisition | 19,284 |
Adjustments to Navilyst purchase price allocation | (2,257 | )
Balance, May 31, 2013 | $ | 355,637 |
Acquisition of Clinical Devices B.V. | 4,836 |
Balance, May 31, 2014 | $ | 360,473 |
Intangible assets | As of May 31, 2014 and 2013, intangible assets consisted of the following:
| May 31, 2014
| Gross carrying value |  | Accumulated amortization |  | Net carrying value |  | Weighted average useful life
| (in thousands) |  | (years)
Product technologies | $ | 150,298 |  |  | $ | (32,930 | ) |  | $ | 117,368 |  |  | 10.2
Customer relationships | 86,645 |  |  | (37,848 | ) |  | 48,797 |  |  | 11.9
Trademark—NAMIC | 28,600 |  |  | — |  |  | 28,600 |  |  | Indefinite
In process R&D Acquired | 3,600 |  |  | — |  |  | 3,600 |  |  | Indefinite
Licenses | 7,639 |  |  | (5,211 | ) |  | 2,428 |  |  | 8.4
Trademarks | 6,345 |  |  | (1,882 | ) |  | 4,463 |  |  | 8.0
Distributor relationships | 900 |  |  | (900 | ) |  | — |  |  | 3.0
| $ | 284,027 |  |  | $ | (78,771 | ) |  | $ | 205,256 |  |  |
| May 31, 2013
| Gross carrying value |  | Accumulated amortization |  | Net carrying value |  | Weighted avg useful life
| (in thousands) |  | (years)
Product technologies (1) | $ | 150,181 |  |  | $ | (24,835 | ) |  | $ | 125,346 |  |  | 10.6
Customer relationships (1) | 84,479 |  |  | (30,770 | ) |  | 53,709 |  |  | 14.8
Trademark—NAMIC | 28,600 |  |  | — |  |  | 28,600 |  |  | Indefinite
Licenses | 6,302 |  |  | (4,501 | ) |  | 1,801 |  |  | 9.0
Trademarks | 6,275 |  |  | (1,058 | ) |  | 5,217 |  |  | 9.9
Distributor relationships | 900 |  |  | (900 | ) |  | — |  |  | 3.0
| $ | 276,737 |  |  | $ | (62,064 | ) |  | $ | 214,673 |  |  |
Expected amortization expense | Annual amortization of these intangible assets is expected to approximate the following amounts for each of the next five fiscal years (in thousands):
2015 | $ | 15,693 |
2016 | 15,696 |
2017 | 16,355 |
2018 | 17,385 |
2019 | 19,928 |

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