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Notes Payable (Details)
6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Instrument
Mar. 31, 2020
USD ($)
Instrument
Sep. 30, 2018
USD ($)
Instrument
Sep. 30, 2017
USD ($)
Instrument
Dec. 31, 2016
USD ($)
Instrument
Oct. 31, 2015
USD ($)
Instrument
May 31, 2014
USD ($)
Instrument
Debt Instrument [Line Items]                    
Debt issuance costs $ 10,144,000                  
Payment of debt issuance costs 126,000 $ 12,743,000                
Payment of make-whole premium 0 $ 21,328,000                
Forward Swap Member                    
Debt Instrument [Line Items]                    
Number of interest rate derivatives terminated | Instrument       2 3 2 2 2 4 3
Aggregate notional amount       $ 120,000,000 $ 200,000,000 $ 250,000,000 $ 250,000,000 $ 180,000,000 $ 300,000,000 $ 225,000,000
Loans Payable                    
Debt Instrument [Line Items]                    
Debt issuance costs 38,145,000   $ 38,145,000              
2051 Notes                    
Debt Instrument [Line Items]                    
Principal $ 450,000,000     $ 450,000,000            
Stated Rate 3.50%     3.50%            
Net Price $ 441,594,000                  
Discount $ 8,406,000                  
Effective Rate 3.602%                  
2052 Notes                    
Debt Instrument [Line Items]                    
Principal $ 450,000,000     $ 450,000,000            
Stated Rate 3.00%     3.00%            
Net Price $ 439,578,000                  
Discount $ 10,422,000                  
Effective Rate 3.118%                  
2022 Notes                    
Debt Instrument [Line Items]                    
Stated Rate 3.30%                  
Notes payable redeemed $ 350,000,000                  
Redemption price percentage 100.00%                  
Payment of make-whole premium $ 21,328,000