CONDENSED CONSOLIDATED BALANCE SHEETS (parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Allowance for doubtful accounts receivable, current	$ 62,220	$ 68,342
Preferred Stock, Shares Authorized	1,000,000	1,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Issued	0	0
Common Stock
Common stock authorized (in shares)	3,999,000,000	3,999,000,000
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock issued (in shares)	776,309,837	771,013,638
Common stock outstanding (in shares)	776,309,837	771,013,638
Common Class B
Common stock authorized (in shares)	100,000,000	100,000,000
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock issued (in shares)	54,744,525
Common stock outstanding (in shares)	54,744,525

Amount of allowance for credit loss on accounts receivable, classified as current.

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