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Acquisitions - Fair Value Assets and Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Assets acquired and liabilities assumed |  |  |  |
Goodwill | $ 542,239 | $ 480,065 | $ 446,318 | $ 336,982
Series of Individually Immaterial Business Acquisitions |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Cash paid at closing | 70,984 | 36,577 | 143,038 |
Contingent consideration from acquisitions | 1,902 | 4,498 | 13,456 |
Deferred payment obligations to sellers |  |  | 690 |
Total consideration | 72,745 | 41,075 | 157,184 |
Assets acquired and liabilities assumed |  |  |  |
Cash |  | 2,523 | 7,774 |
Prepaid and other current assets | 5,671 | 1,782 | 4,790 |
Property and equipment | 172 | 411 | 340 |
Other assets | 36 | 84 |  |
Total identifiable assets acquired excluding goodwill | 23,922 | 15,338 | 52,986 |
Deferred tax liability | (1,005) | (1,869) | (8,917) |
Other current liabilities | (2,458) | (3,538) | (3,848) |
Deferred revenues | (4,274) | (2,897) | (6,181) |
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 |
Goodwill amount expected to be deductible for tax purposes | $ 24,085 | 6,501 |  |
Customer relationships |  |  |  |
Assets acquired and liabilities assumed |  |  |  |
Weighted average useful life | 7 years |  |  |
Customer relationships | Series of Individually Immaterial Business Acquisitions |  |  |  |
Assets acquired and liabilities assumed |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 8,854 | 6,534 | 27,294 |
Software And Technology [Member] | Series of Individually Immaterial Business Acquisitions |  |  |  |
Assets acquired and liabilities assumed |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | $ 2,423 | 9,332 |
Weighted average useful life |  | 3 years |  |
In Process Research and Development [Member] | Series of Individually Immaterial Business Acquisitions |  |  |  |
Assets acquired and liabilities assumed |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | 1,366 |
Non-compete agreement | Series of Individually Immaterial Business Acquisitions |  |  |  |
Assets acquired and liabilities assumed |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | $ 150 |  |
Weighted average useful life |  | 5 years |  |
Trademarks | Series of Individually Immaterial Business Acquisitions |  |  |  |
Assets acquired and liabilities assumed |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 3,050 | $ 1,431 | $ 2,090 |
Minimum | Customer relationships | Series of Individually Immaterial Business Acquisitions |  |  |  |
Assets acquired and liabilities assumed |  |  |  |
Weighted average useful life |  | 5 years |  |
Minimum | Trademarks | Series of Individually Immaterial Business Acquisitions |  |  |  |
Assets acquired and liabilities assumed |  |  |  |
Weighted average useful life |  | 5 years |  |
Maximum | Customer relationships | Series of Individually Immaterial Business Acquisitions |  |  |  |
Assets acquired and liabilities assumed |  |  |  |
Weighted average useful life |  | 7 years |  |
Maximum | Trademarks | Series of Individually Immaterial Business Acquisitions |  |  |  |
Assets acquired and liabilities assumed |  |  |  |
Weighted average useful life |  | 7 years |  |

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