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GEOGRAPHIC INFORMATION - Revenue and Long-Lived Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue and Long-lived Assets by Geography |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 651,407 | $ 639,770 | $ 555,450 | $ 544,642 | $ 547,167 | $ 541,493 | $ 497,973 | $ 464,625 | $ 2,391,269 | $ 2,051,258 | $ 1,729,850
Long-lived assets (excluding goodwill and intangible assets) | 107,799 |  |  |  | 101,065 |  |  |  | 107,799 | 101,065 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenue and Long-lived Assets by Geography |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,121,957 | 972,747 | 872,977
Long-lived assets (excluding goodwill and intangible assets) | 91,683 |  |  |  | 83,630 |  |  |  | $ 91,683 | 83,630 |
United States | Revenue Benchmark | Geographic Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Revenue and Long-lived Assets by Geography |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percent) |  |  |  |  |  |  |  |  | 10.00% |  |
United States | Property, Plant and Equipment | Geographic Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Revenue and Long-lived Assets by Geography |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percent) |  |  |  |  |  |  |  |  | 10.00% |  |
All other countries |  |  |  |  |  |  |  |  |  |  |
Revenue and Long-lived Assets by Geography |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 1,269,312 | 1,078,511 | $ 856,873
Long-lived assets (excluding goodwill and intangible assets) | $ 16,116 |  |  |  | $ 17,435 |  |  |  | $ 16,116 | $ 17,435 |

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