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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the nine months ended September 30, 2018, by reportable business segment, were as follows:
| FMT |  | HST |  | FSDP |  | IDEX
Balance at December 31, 2017 | $ | 586,064 |  |  | $ | 740,032 |  |  | $ | 378,062 |  |  | $ | 1,704,158 |
Foreign currency translation | (2,423 | ) |  | (2,765 | ) |  | (3,259 | ) |  | (8,447 | )
Acquisitions | — |  |  | 11,920 |  |  | — |  |  | 11,920 |
Acquisition adjustments | — |  |  | 1,152 |  |  | — |  |  | 1,152 |
Balance at September 30, 2018 | $ | 583,641 |  |  | $ | 750,339 |  |  | $ | 374,803 |  |  | $ | 1,708,783 |
Schedule of Gross Carrying Value and Accumulated Amortization For Each Major Class of Intangible Asset | The following table provides the gross carrying value and accumulated amortization for each major class of intangible asset at September 30, 2018 and December 31, 2017:
| At September 30, 2018 |  |  |  | At December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Weighted Average Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Amortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Patents | $ | 9,640 |  |  | $ | (7,789 | ) |  | $ | 1,851 |  |  | 12 |  | $ | 9,633 |  |  | $ | (7,143 | ) |  | $ | 2,490 |
Trade names | 116,895 |  |  | (55,799 | ) |  | 61,096 |  |  | 16 |  | 117,206 |  |  | (50,604 | ) |  | 66,602 |
Customer relationships | 258,789 |  |  | (81,485 | ) |  | 177,304 |  |  | 14 |  | 317,316 |  |  | (124,566 | ) |  | 192,750 |
Unpatented technology | 98,151 |  |  | (34,015 | ) |  | 64,136 |  |  | 12 |  | 91,166 |  |  | (29,428 | ) |  | 61,738 |
Other | 700 |  |  | (490 | ) |  | 210 |  |  | 10 |  | 839 |  |  | (573 | ) |  | 266 |
Total amortized intangible assets | 484,175 |  |  | (179,578 | ) |  | 304,597 |  |  |  |  | 536,160 |  |  | (212,314 | ) |  | 323,846 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Banjo trade name | 62,100 |  |  | — |  |  | 62,100 |  |  |  |  | 62,100 |  |  | — |  |  | 62,100 |
Akron Brass trade name | 28,800 |  |  | — |  |  | 28,800 |  |  |  |  | 28,800 |  |  | — |  |  | 28,800 |
Total intangible assets | $ | 575,075 |  |  | $ | (179,578 | ) |  | $ | 395,497 |  |  |  |  | $ | 627,060 |  |  | $ | (212,314 | ) |  | $ | 414,746 |

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