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Debt (Details 2) - USD ($)
3 Months Ended 9 Months Ended
Jun. 10, 2023
Sep. 30, 2016
Jul. 07, 2016
Jun. 30, 2016
Jun. 10, 2016
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Aug. 11, 2016
Mar. 31, 2016
Jan. 07, 2016
Debt                          
Maturity date Jun. 10, 2023                        
Total principal   $ 794,780,000       $ 488,926,000 $ 794,780,000   $ 794,780,000        
Interest expense, debt             6,500,000 $ 3,000,000 14,000,000 $ 6,300,000      
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020                          
Debt                          
Maximum borrowing capacity under accordion feature   750,000,000       $ 750,000,000 750,000,000   750,000,000        
Amount outstanding   206,000,000         206,000,000   206,000,000        
Current borrowing capacity   $ 643,900,000.0         $ 643,900,000.0   $ 643,900,000.0        
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020 | Operating Partnership                          
Debt                          
Interest rate at end of period (as a percent)   3.30%         3.30%   3.30%        
Term Loan                          
Debt                          
Amount outstanding   $ 250,000,000         $ 250,000,000   $ 250,000,000        
Senior notes                          
Debt                          
Debt instrument, face amount                     $ 75,000,000   $ 150,000,000
Credit Agreement Amendment [Member]                          
Debt                          
Unused fee (as a percent)         0.25%                
Maximum borrowing capacity as a percentage of maximum principal amount         10.00%                
Increase in maximum borrowing capacity         $ 500,000,000                
Maximum borrowing capacity under accordion feature         1,600,000,000                
Current borrowing capacity         $ 1,100,000,000                
Series A                          
Debt                          
Interest rate (as a percent)                     4.09%   4.03%
Series A | Senior notes                          
Debt                          
Debt instrument, face amount                     $ 25,000,000   $ 15,000,000
Series B                          
Debt                          
Interest rate (as a percent)                     4.18%   4.43%
Series B | Senior notes                          
Debt                          
Debt instrument, face amount                     $ 25,000,000   $ 45,000,000
Series C                          
Debt                          
Interest rate (as a percent)                     4.24%   4.57%
Series C | Senior notes                          
Debt                          
Debt instrument, face amount                     $ 25,000,000   $ 45,000,000
Series D                          
Debt                          
Interest rate (as a percent)                         4.74%
Series D | Senior notes                          
Debt                          
Debt instrument, face amount                         $ 45,000,000
London Interbank Offered Rate (LIBOR) | $850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020                          
Debt                          
Reference rate (as a percent)       1.20%   1.20%              
London Interbank Offered Rate (LIBOR) | Credit Agreement Amendment [Member]                          
Debt                          
Reference rate (as a percent)         1.20%                
London Interbank Offered Rate (LIBOR) | Adjusted LIBOR rate loans and letter of credit | Credit rating at least A- or A3                          
Debt                          
Reference rate (as a percent)   0.85%                      
London Interbank Offered Rate (LIBOR) | Adjusted LIBOR rate loans and letter of credit | Credit rating at least BBBplus or BAA1                          
Debt                          
Reference rate (as a percent)   0.90%                      
London Interbank Offered Rate (LIBOR) | Adjusted LIBOR rate loans and letter of credit | Credit rating at least BBB or BAA2                          
Debt                          
Reference rate (as a percent)   1.00%                      
London Interbank Offered Rate (LIBOR) | Adjusted LIBOR rate loans and letter of credit | Credit rating at least BBB- or BAA3                          
Debt                          
Reference rate (as a percent)   1.20%                      
London Interbank Offered Rate (LIBOR) | Adjusted LIBOR rate loans and letter of credit | Credit rating below BBB- or BAA3                          
Debt                          
Reference rate (as a percent)   1.55%                      
London Interbank Offered Rate (LIBOR) | Adjusted LIBOR Rate Term Loans And Letter Of Credit [Member] | Credit rating at least A- or A3                          
Debt                          
Reference rate (as a percent)   1.40%                      
London Interbank Offered Rate (LIBOR) | Adjusted LIBOR Rate Term Loans And Letter Of Credit [Member] | Credit rating at least BBBplus or BAA1                          
Debt                          
Reference rate (as a percent)   1.45%                      
London Interbank Offered Rate (LIBOR) | Adjusted LIBOR Rate Term Loans And Letter Of Credit [Member] | Credit rating at least BBB or BAA2                          
Debt                          
Reference rate (as a percent)   1.55%                      
London Interbank Offered Rate (LIBOR) | Adjusted LIBOR Rate Term Loans And Letter Of Credit [Member] | Credit rating at least BBB- or BAA3                          
Debt                          
Reference rate (as a percent)   1.80%                      
London Interbank Offered Rate (LIBOR) | Adjusted LIBOR Rate Term Loans And Letter Of Credit [Member] | Credit rating below BBB- or BAA3                          
Debt                          
Reference rate (as a percent)   2.25%                      
Term Loan | Credit Agreement Amendment [Member]                          
Debt                          
Debt Instrument, Term     7 years                    
Current borrowing capacity         $ 250,000,000                
Term Loan | Base rate | Base rate loans | Credit rating at least A- or A3                          
Debt                          
Reference rate (as a percent)                 0.40%        
Term Loan | Base rate | Base rate loans | Credit rating at least BBBplus or BAA1                          
Debt                          
Reference rate (as a percent)                 0.45%        
Term Loan | Base rate | Base rate loans | Credit rating at least BBB or BAA2                          
Debt                          
Reference rate (as a percent)                 0.55%        
Term Loan | Base rate | Base rate loans | Credit rating at least BBB- or BAA3                          
Debt                          
Reference rate (as a percent)                 0.80%        
Term Loan | Base rate | Base rate loans | Credit rating below BBB- or BAA3                          
Debt                          
Reference rate (as a percent)                 1.25%        
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020                          
Debt                          
Term of extension option         1 year                
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020 | Credit Agreement Amendment [Member]                          
Debt                          
Current borrowing capacity         $ 850,000,000             $ 750,000,000  
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020 | Base rate | Base rate loans | Credit rating at least A- or A3                          
Debt                          
Reference rate (as a percent)                 0.00%        
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020 | Base rate | Base rate loans | Credit rating at least BBBplus or BAA1                          
Debt                          
Reference rate (as a percent)                 0.00%        
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020 | Base rate | Base rate loans | Credit rating at least BBB or BAA2                          
Debt                          
Reference rate (as a percent)                 0.10%        
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020 | Base rate | Base rate loans | Credit rating at least BBB- or BAA3                          
Debt                          
Reference rate (as a percent)                 0.20%        
$850 million unsecured revolving credit facility bearing variable interest of LIBOR plus 1.20%, due September 2020 | Base rate | Base rate loans | Credit rating below BBB- or BAA3                          
Debt                          
Reference rate (as a percent)                 0.60%        
Interest Rate Swap                          
Debt                          
Effective fixed interest rate     2.87%                    
Interest Rate Swap | London Interbank Offered Rate (LIBOR)                          
Debt                          
Effective fixed interest rate     1.07%