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Acquisitions (Details) - USD ($) $ in Thousands	Jun. 07, 2021	Mar. 02, 2021	Sep. 30, 2021	Dec. 31, 2020
Acquisitions
Goodwill arising in the acquisition			$ 522,814	$ 518,592
Series of Individually Immaterial Business Acquisitions
Acquisitions
Goodwill arising in the acquisition	$ 4,700	$ 1,100
Customer relationships | Series of Individually Immaterial Business Acquisitions
Acquisitions
Finite-lived intangible assets acquired	$ 7,400	1,200
Non-compete agreements | Series of Individually Immaterial Business Acquisitions
Acquisitions
Finite-lived intangible assets acquired		$ 100

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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