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Accounts payable, accrued expenses and other liabilities
 12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Accounts payable, accrued expenses and other liabilities Accounts payable, accrued expenses and other liabilities
Accounts payable, accrued expenses and other liabilities consisted of the following as of December 31, 2020 and 2019:
As of December 31,
20202019
Deferred revenue$399,820 $389,958 
Accrued interest270,576 255,369 
Accounts payable and accrued expenses222,203 239,086 
Derivative liabilities (Note 10)167,303 97,066 
Operating lease liabilities (Note 15)49,423 51,144 
$1,109,325 $1,032,623