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Notes Payable (Narrative) (Details)
12 Months Ended
Sep. 18, 2017
USD ($)
item
Apr. 12, 2016
USD ($)
Nov. 03, 2015
USD ($)
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Apr. 12, 2019
USD ($)
Apr. 12, 2016
EUR (€)
Nov. 03, 2015
EUR (€)
Debt Instrument [Line Items]                  
Proceeds from Issuance of Debt       $ 496,900,000   $ 992,077,000      
Foreign currency exchange gain (loss)       7,829,000 $ 18,117,000 (50,045,000)      
Cash paid for interest expense       48,300,000 36,300,000 16,800,000      
Interest capitalized as real estate       $ 3,900,000 $ 4,800,000 $ 4,400,000      
Mortgage Notes [Member]                  
Debt Instrument [Line Items]                  
Interest rate       3.90%          
Mortgage debt assumed       $ 1,800,000          
Mortgage Notes [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Interest rate       3.20%          
Maturity date       Jan. 01, 2022          
Mortgage Notes [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Interest rate       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       5.00%          
Adjusted EBTIDA to interest Expense ratio       47          
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       2          
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%          
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%          
Maturity date       Apr. 12, 2024 Apr. 12, 2024        
Proceeds from Issuance of Debt   $ 113,600,000