Other Assets - Summary of Credit Loss Allowance (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance January 1, 2021		$ 85,447
Loss provision for receivables	$ 6,000	16,734	$ 135,700	$ 81,600
Write-offs		(4,723)
Ending balance September 30, 2021		$ 97,458		$ 85,447