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Future Minimum Rents and Lease Payments - Narratives (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
contract
Dec. 31, 2020
USD ($)
Operating Leased Assets    
Operating lease payment | $ $ 608,360  
Operating lease liabilities | $ 280,210 $ 270,014
Operating lease right-of-use assets | $ $ 273,997 $ 264,880
Ground Lease    
Operating Leased Assets    
Number of operating lease contracts (contract) | contract 13  
Office    
Operating Leased Assets    
Number of operating lease contracts (contract) | contract 2  
Facility    
Operating Leased Assets    
Number of operating lease contracts (contract) | contract 3