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Intangible Assets, Net - Schedule of Activity in Intangible Assets, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Intangible assets, net    
Balance, beginning of period $ 280,264 $ 310,391
Additions 120,388 0
Amortization (9,465) (7,533)
Balance, end of period $ 391,187 $ 302,858