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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the three months ended March 31, 2019, by reportable business segment, were as follows:
| FMT |  | HST |  | FSDP |  | IDEX
Balance at December 31, 2018 | $ | 581,041 |  |  | $ | 745,357 |  |  | $ | 371,557 |  |  | $ | 1,697,955 |
Foreign currency translation | (1,796 | ) |  | (49 | ) |  | (1,890 | ) |  | (3,735 | )
Acquisition adjustments | — |  |  | 188 |  |  | — |  |  | 188 |
Balance at March 31, 2019 | $ | 579,245 |  |  | $ | 745,496 |  |  | $ | 369,667 |  |  | $ | 1,694,408 |
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 March 31, 2019 and December 31, 2018:
| At March 31, 2019 |  |  |  | At December 31, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Weighted Average Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Amortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Patents | $ | 6,528 |  |  | $ | (4,839 | ) |  | $ | 1,689 |  |  | 12 |  | $ | 6,468 |  |  | $ | (4,693 | ) |  | $ | 1,775 |
Trade names | 115,788 |  |  | (59,109 | ) |  | 56,679 |  |  | 16 |  | 115,899 |  |  | (57,227 | ) |  | 58,672 |
Customer relationships | 254,923 |  |  | (90,430 | ) |  | 164,493 |  |  | 14 |  | 256,202 |  |  | (85,652 | ) |  | 170,550 |
Unpatented technology | 96,976 |  |  | (38,172 | ) |  | 58,804 |  |  | 12 |  | 96,922 |  |  | (35,685 | ) |  | 61,237 |
Other | 700 |  |  | (525 | ) |  | 175 |  |  | 10 |  | 700 |  |  | (507 | ) |  | 193 |
Total amortized intangible assets | 474,915 |  |  | (193,075 | ) |  | 281,840 |  |  |  |  | 476,191 |  |  | (183,764 | ) |  | 292,427 |
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 | $ | 565,815 |  |  | $ | (193,075 | ) |  | $ | 372,740 |  |  |  |  | $ | 567,091 |  |  | $ | (183,764 | ) |  | $ | 383,327 |

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