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Goodwill and Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |
Goodwill |  |  | $ 1,898,586
Accumulated goodwill impairment losses |  |  | (200,631)
Goodwill |  |  |
Beginning Balance | $ 1,779,745 | $ 1,697,955 |
Foreign currency translation | 52,548 | (4,149) |
Acquisitions | 61,483 | 85,939 |
Acquisition adjustments | 1,798 |  |
Ending Balance | 1,895,574 | 1,779,745 |
FMT |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |
Goodwill |  |  | 601,762
Accumulated goodwill impairment losses |  |  | (20,721)
Goodwill |  |  |
Beginning Balance | 578,925 | 581,041 |
Foreign currency translation | 10,365 | (2,116) |
Acquisitions | 60,431 | 0 |
Acquisition adjustments | 0 |  |
Ending Balance | 649,721 | 578,925 |
HST |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |
Goodwill |  |  | 895,177
Accumulated goodwill impairment losses |  |  | (149,820)
Goodwill |  |  |
Beginning Balance | 831,772 | 745,357 |
Foreign currency translation | 29,058 | 476 |
Acquisitions | 0 | 85,939 |
Acquisition adjustments | 1,798 |  |
Ending Balance | 862,628 | 831,772 |
FSDP |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |
Goodwill |  |  | 401,647
Accumulated goodwill impairment losses |  |  | $ (30,090)
Goodwill |  |  |
Beginning Balance | 369,048 | 371,557 |
Foreign currency translation | 13,125 | (2,509) |
Acquisitions | 1,052 | 0 |
Acquisition adjustments | 0 |  |
Ending Balance | $ 383,225 | $ 369,048 |

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