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Goodwill and Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | $ 1,980,376
Accumulated goodwill impairment losses |  | (200,631)
Goodwill [Roll Forward] |  |
Balance at December 31, 2019 | $ 1,779,745 |
Foreign currency translation | (1,820) |
Acquisitions | 63,007 |
Acquisition adjustments | 1,798 |
Balance at June 30, 2020 | 1,842,730 |
FMT |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | 599,646
Accumulated goodwill impairment losses |  | (20,721)
Goodwill [Roll Forward] |  |
Balance at December 31, 2019 | 578,925 |
Foreign currency translation | 217 |
Acquisitions | 63,007 |
Acquisition adjustments | 0 |
Balance at June 30, 2020 | 642,149 |
HST |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | 981,592
Accumulated goodwill impairment losses |  | (149,820)
Goodwill [Roll Forward] |  |
Balance at December 31, 2019 | 831,772 |
Foreign currency translation | (1,946) |
Acquisitions | 0 |
Acquisition adjustments | 1,798 |
Balance at June 30, 2020 | 831,624 |
FSDP |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |
Goodwill |  | 399,138
Accumulated goodwill impairment losses |  | $ (30,090)
Goodwill [Roll Forward] |  |
Balance at December 31, 2019 | 369,048 |
Foreign currency translation | (91) |
Acquisitions | 0 |
Acquisition adjustments | 0 |
Balance at June 30, 2020 | $ 368,957 |

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