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Notes Payable (Notes Payable) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Apr. 12, 2019
Principal $ 1,910,864    
Unamortized Costs (8,371)    
Book Value 1,902,493 $ 1,412,283  
Fair Value 2,001,080 1,380,727  
U.S. Dollar Denominated Unsecured Debt [Member]      
Principal 1,500,000    
Unamortized Costs (8,371)    
Book Value 1,491,629 993,449  
Fair Value $ 1,558,244 951,072  
U.S. Dollar Denominated Unsecured Debt [Member] | Notes Due September 15, 2022 [Member]      
Coupon Rate 2.37%    
Effective Rate 2.483%    
Principal $ 500,000    
Unamortized Costs (1,419)    
Book Value 498,581 498,053  
Fair Value $ 505,639 $ 482,017  
Maturity date Sep. 15, 2022 Sep. 15, 2022  
U.S. Dollar Denominated Unsecured Debt [Member] | Notes Due September 15, 2027 [Member]      
Coupon Rate 3.094%    
Effective Rate 3.218%    
Principal $ 500,000    
Unamortized Costs (4,076)    
Book Value 495,924 $ 495,396  
Fair Value $ 520,694 $ 469,055  
Maturity date Sep. 15, 2027 Sep. 15, 2027  
U.S. Dollar Denominated Unsecured Debt [Member] | Notes Due May 1, 2029 [Member]      
Coupon Rate 3.385%   3.385%
Effective Rate 3.459%    
Principal $ 500,000    
Unamortized Costs (2,876)    
Book Value 497,124    
Fair Value $ 531,911    
Maturity date May 01, 2029 May 01, 2029  
Euro Denominated Unsecured Debt [Member]      
Principal $ 383,589    
Book Value 383,589 $ 391,431  
Fair Value $ 414,330 402,042  
Euro Denominated Unsecured Debt [Member] | Notes Due April 12, 2024 [Member]      
Coupon Rate 1.54%    
Effective Rate 1.54%    
Principal $ 112,156    
Book Value 112,156 114,449  
Fair Value $ 115,932 $ 115,964  
Maturity date Apr. 12, 2024 Apr. 12, 2024  
Euro Denominated Unsecured Debt [Member] | Notes Due November 3, 2025 [Member]      
Coupon Rate 2.175%    
Effective Rate 2.175%    
Principal $ 271,433    
Book Value 271,433 $ 276,982  
Fair Value $ 298,398 $ 286,078  
Maturity date Nov. 03, 2025 Nov. 03, 2025  
Mortgage Debt [Member]      
Coupon Rate 4.025%    
Effective Rate 3.995%    
Principal $ 27,275    
Book Value 27,275 $ 27,403  
Fair Value 28,506 $ 27,613  
Mortgage Debt [Member] | Secured By Real Estate Facilities [Member]      
Net book value of real estate facilities securing notes payable $ 105,700    
Real estate facilities securing debt | item 27