Annual report pursuant to Section 13 and 15(d)

Debt, Net (Debt Schedule) (Details)

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Debt, Net (Debt Schedule) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Nov. 17, 2021
Aug. 11, 2021
Mar. 11, 2021
Dec. 31, 2020
Sep. 17, 2020
Debt            
Carrying Value $ 2,272,304,000       $ 2,086,918,000  
Revolving Credit Facility            
Debt            
Carrying Value $ 76,000,000       143,000,000  
Weighted average interest rate 1.20%          
Term Loan Facility            
Debt            
Interest rate 1.10%          
Carrying Value $ 299,420,000       398,447,000  
Unsecured note payable            
Debt            
Interest rate 0.00%          
Carrying Value $ 753,000       900,000  
Unamortized discount included in carrying value $ 108,000       161,000  
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Minimum            
Debt            
Variable rate, spread 0.775%          
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Maximum            
Debt            
Variable rate, spread 1.45%          
London Interbank Offered Rate (LIBOR) | Term Loan Facility | Minimum            
Debt            
Variable rate, spread 1.00%          
London Interbank Offered Rate (LIBOR) | Term Loan Facility | Maximum            
Debt            
Variable rate, spread 1.65%          
Mortgage and other secured debt            
Debt            
Carrying Value $ 120,627,000       255,110,000  
Mortgage and other secured debt | Fixed rate mortgage debt            
Debt            
Carrying Value $ 86,960,000       139,991,000  
Unamortized premium included in carrying value         155,000  
Weighted average interest rate 4.07%          
Mortgage and other secured debt | Fixed rate mortgage debt | Minimum            
Debt            
Interest rate 3.82%          
Mortgage and other secured debt | Fixed rate mortgage debt | Maximum            
Debt            
Interest rate 4.62%          
Mortgage and other secured debt | Variable rate secured loans            
Debt            
Carrying Value $ 33,667,000       115,119,000  
Weighted average interest rate 1.62%          
Mortgage and other secured debt | London Interbank Offered Rate (LIBOR) | Variable rate secured loans | Minimum            
Debt            
Variable rate, spread 1.45%          
Mortgage and other secured debt | London Interbank Offered Rate (LIBOR) | Variable rate secured loans | Maximum            
Debt            
Variable rate, spread 1.55%          
Senior Notes | 2.25%, $400,000 aggregate principal            
Debt            
Interest rate 2.25%          
Debt instrument, face amount $ 400,000,000         $ 400,000,000
Carrying Value 395,491,000       394,464,000  
Unamortized discount included in carrying value $ 3,600,000       4,500,000  
Effective interest rate on debt 2.48%          
Senior Notes | 2.00%, $400,000 aggregate principal            
Debt            
Interest rate 2.00%          
Debt instrument, face amount $ 400,000,000   $ 400,000,000      
Carrying Value 396,512,000       0  
Unamortized discount included in carrying value $ 2,500,000          
Effective interest rate on debt 2.09%          
Senior Notes | 2.75%, $600,000 aggregate principal            
Debt            
Interest rate 2.75%          
Debt instrument, face amount $ 600,000,000     $ 600,000,000    
Carrying Value 589,060,000       0  
Unamortized discount included in carrying value $ 9,500,000          
Effective interest rate on debt 2.94%          
Senior Notes | 2.90%, $400,000 aggregate principal            
Debt            
Interest rate 2.90%          
Debt instrument, face amount $ 400,000,000 $ 400,000,000        
Carrying Value 394,441,000       0  
Unamortized discount included in carrying value $ 4,500,000          
Effective interest rate on debt 3.01%          
Senior Notes | 3.60%, $350,000 aggregate principal            
Debt            
Interest rate 3.60%          
Debt instrument, face amount $ 350,000,000          
Carrying Value $ 0       348,888,000  
Unamortized discount included in carrying value         $ 781,000  
Effective interest rate on debt         3.70%  
Senior Notes | 5.25%, $250,000 aggregate principal            
Debt            
Interest rate 5.25%          
Debt instrument, face amount $ 250,000,000          
Carrying Value $ 0       $ 248,194,000  
Unamortized discount included in carrying value         $ 1,600,000  
Effective interest rate on debt         5.49%  
Senior Notes | 5.00%, $300,000 aggregate principal            
Debt            
Interest rate 5.00%          
Debt instrument, face amount $ 300,000,000          
Carrying Value 0       $ 297,915,000  
Unamortized discount included in carrying value         $ 1,800,000  
Effective interest rate on debt         5.15%  
Loans Payable            
Debt            
Net deferred financing costs $ 5,800,000       $ 5,900,000  
Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility            
Debt            
Variable rate, spread 0.775%          
Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum | Revolving Credit Facility            
Debt            
Variable rate, spread 1.45%