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Deferred Costs (Tables)
 9 Months Ended
Sep. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of components of deferred costs
Deferred costs as of September 30, 2021 and December 31, 2020 consisted of the following (in thousands):
September 30, 2021December 31, 2020
Deferred leasing costs$401,826 $447,002 
Less: accumulated amortization
(277,189)(269,834)
Deferred costs, net$124,637 $177,168