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Notes Payable (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 24, 2020
USD ($)
Sep. 18, 2017
USD ($)
item
Apr. 12, 2016
USD ($)
Nov. 03, 2015
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
item
Jun. 30, 2019
USD ($)
Dec. 31, 2019
Jan. 24, 2020
EUR (€)
Apr. 12, 2019
USD ($)
Apr. 12, 2016
EUR (€)
Nov. 03, 2015
EUR (€)
Debt Instrument [Line Items]                          
Proceeds from Issuance of Debt             $ 545,151,000 $ 496,900,000          
Foreign currency exchange (loss) gain         $ (19,295,000) $ (5,218,000) (10,350,000) 2,573,000          
Cash paid for interest expense             26,400,000 21,800,000          
Interest capitalized as real estate         $ 1,700,000 $ 2,000,000.0 $ 1,700,000 $ 2,000,000.0          
Mortgage Notes [Member] | Minimum [Member]                          
Debt Instrument [Line Items]                          
Interest rate         3.20%   3.20%            
Maturity date             Jan. 01, 2022            
Mortgage Notes [Member] | Maximum [Member]                          
Debt Instrument [Line Items]                          
Interest rate         7.10%   7.10%            
Maturity date             Jul. 01, 2030            
U.S. Dollar Denominated Unsecured Debt [Member]                          
Debt Instrument [Line Items]                          
Issuance date             Sep. 18, 2017            
Number of tranches | item   2                      
Debt issuance amount   $ 500,000,000.0                      
Debt issuance costs   $ 7,900,000                      
Debt to Total Assets ratio             8.00%            
Adjusted EBTIDA to interest Expense ratio             40            
U.S. Dollar Denominated Unsecured Debt [Member] | Minimum [Member]                          
Debt Instrument [Line Items]                          
Adjusted EBTIDA to interest Expense ratio             1.5            
U.S. Dollar Denominated Unsecured Debt [Member] | Notes Due May 1, 2029 [Member]                          
Debt Instrument [Line Items]                          
Issuance date             Apr. 12, 2019            
Debt issuance amount                     $ 500,000,000    
Debt issuance costs                     $ 3,100,000    
Interest rate         3.385%   3.385%            
Maturity date             May 01, 2029   May 01, 2029        
U.S. Dollar Denominated Unsecured Debt [Member] | Maximum Covenant [Member]                          
Debt Instrument [Line Items]                          
Debt to Total Assets ratio             65.00%            
Euro Denominated Unsecured Debt [Member]                          
Debt Instrument [Line Items]                          
Number of tranches | item             3            
Euro Denominated Unsecured Debt [Member] | Notes Due November 3, 2025 [Member]                          
Debt Instrument [Line Items]                          
Issuance date             Nov. 03, 2015            
Debt issuance amount | €                         € 242,000,000.0
Interest rate         2.175%   2.175%            
Maturity date             Nov. 03, 2025   Nov. 03, 2025        
Proceeds from Issuance of Debt       $ 264,300,000                  
Euro Denominated Unsecured Debt [Member] | Notes Due April 12, 2024 [Member]                          
Debt Instrument [Line Items]                          
Issuance date             Apr. 12, 2016            
Debt issuance amount | €                       € 100,000,000.0  
Interest rate         1.54%   1.54%            
Maturity date             Apr. 12, 2024   Apr. 12, 2024        
Proceeds from Issuance of Debt     $ 113,600,000                    
Euro Denominated Unsecured Debt [Member] | Notes Due January 24, 2032 [Member]                          
Debt Instrument [Line Items]                          
Issuance date             Jan. 24, 2020            
Debt issuance amount | €                   € 500,000,000.0      
Interest rate         0.875%   0.875%            
Maturity date             Jan. 24, 2032            
Proceeds from Issuance of Debt $ 545,200,000