CONSOLIDATED FINANCIAL STATEMENT DETAILS - Accumulated Amortization and Depreciation (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Depreciation, Depletion and Amortization [Abstract]
Right-of-use assets (included in “other non-current assets”)	$ 55,284	$ 40,800
Capitalized software, leasehold improvements, and equipment	96,956	95,438
Intangible assets	$ 155,820	$ 162,627