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Acquisitions - Schedule of Consideration and Net Assets Acquired (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Goodwill | $ 542,239 | $ 480,065 | $ 446,318 | $ 336,982
Customer relationships |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 7 years |  |  |
Software and technology |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 3 years |  |  |
Non-compete agreements |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 5 years |  |  |
Non-compete agreements | Minimum |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 9 years |  |  |
Non-compete agreements | Maximum |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 5 years |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |
Cash paid at closing | $ 70,984 | 36,577 | 143,038 |
Contingent consideration from acquisitions | 1,902 | 4,498 | 13,456 |
Non-contingent consideration from acquisitions | (141) | 0 |  |
Total consideration | 72,745 | 41,075 | 157,184 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Cash | 2,064 | 2,523 |  |
Prepaid and other current assets | 5,671 | 1,782 | 4,790 |
Operating lease right-of-use assets | 1,668 | 0 |  |
Property and equipment | 172 | 411 | 340 |
Other assets | 36 | 84 |  |
Total identifiable assets acquired excluding goodwill | 23,922 | 15,338 | 52,986 |
Accruals and other current liabilities | (2,458) | (3,538) | (3,848) |
Deferred revenues | (4,274) | (2,897) | (6,181) |
Operating lease liabilities | (1,668) | 0 |  |
Deferred income taxes | (1,005) | (1,869) | (8,917) |
Other liabilities | (87) | 0 |  |
Total liabilities assumed | (9,492) | (8,304) | (18,946) |
Net identifiable assets acquired excluding goodwill | 14,430 | 7,034 | 34,040 |
Goodwill | 58,315 | 34,041 | 123,144 |
Net assets acquired | 72,745 | 41,075 | 157,184 |
Series of Individually Immaterial Business Acquisitions | Customer relationships |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Finite-lived intangibles | 8,854 | $ 6,534 | 27,294 |
Series of Individually Immaterial Business Acquisitions | Customer relationships | Minimum |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  | 5 years |  |
Series of Individually Immaterial Business Acquisitions | Customer relationships | Maximum |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  | 7 years |  |
Series of Individually Immaterial Business Acquisitions | Software and technology |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Finite-lived intangibles | 2,207 | $ 2,423 |  |
Series of Individually Immaterial Business Acquisitions | Non-compete agreements |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Finite-lived intangibles | 200 | 150 |  |
Series of Individually Immaterial Business Acquisitions | Trademarks |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Finite-lived intangibles | $ 3,050 | $ 1,431 | $ 2,090 |
Series of Individually Immaterial Business Acquisitions | Trademarks | Minimum |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  | 5 years |  |
Series of Individually Immaterial Business Acquisitions | Trademarks | Maximum |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  | 7 years |  |

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