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SEGMENT 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 | $ 359,301 | $ 389,913 | $ 375,061 | $ 343,650 | $ 321,508 | $ 357,358 | $ 343,896 | $ 303,443 | $ 1,467,925 | $ 1,326,205 | $ 1,132,241
Long-lived assets (excluding goodwill and intangible assets) | 108,842 |  |  |  | 103,361 |  |  |  | 108,842 | 103,361 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenue and Long-lived Assets by Geography |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,379,236 | 1,234,755 | $ 1,050,641
Long-lived assets (excluding goodwill and intangible assets) | 97,841 |  |  |  | 95,822 |  |  |  | $ 97,841 | $ 95,822 |
United States | Geographic Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Revenue and Long-lived Assets by Geography |  |  |  |  |  |  |  |  |  |  |
Revenue concentration risk percentage (greater than) |  |  |  |  |  |  |  |  | 95.00% |  |
United States | Revenue Benchmark | Geographic Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Revenue and Long-lived Assets by Geography |  |  |  |  |  |  |  |  |  |  |
Revenue concentration risk percentage (greater than) |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00%
All other countries |  |  |  |  |  |  |  |  |  |  |
Revenue and Long-lived Assets by Geography |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 88,689 | $ 91,450 | $ 81,600
Long-lived assets (excluding goodwill and intangible assets) | $ 11,001 |  |  |  | $ 7,539 |  |  |  | $ 11,001 | $ 7,539 |

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