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Notes Payable (Notes Payable) (Details) $ in Thousands			9 Months Ended
	Sep. 30, 2021 USD ($)	Apr. 23, 2021	Sep. 30, 2021 USD ($) company	Jan. 19, 2021	Dec. 31, 2020 USD ($)
Principal	$ 5,810,759		$ 5,810,759
Unamortized Costs	(37,569)		(37,569)
Book Value	5,773,190		5,773,190		$ 2,544,992
Fair Value	5,941,874		5,941,874		2,767,176
U.S. Dollar Denominated Unsecured Debt
Principal	4,000,000		4,000,000
Unamortized Costs	(22,031)		(22,031)
Book Value	3,977,969		3,977,969		1,492,994
Fair Value	$ 4,115,543		$ 4,115,543		1,653,085
U.S. Dollar Denominated Unsecured Debt | Notes due September 15, 2022
Coupon Rate	2.37%		2.37%
Effective Rate	2.483%		2.483%
Principal	$ 500,000		$ 500,000
Unamortized Costs	(495)		(495)
Book Value	499,505		499,505		499,109
Fair Value	$ 509,800		$ 509,800		517,419
U.S. Dollar Denominated Unsecured Debt | Notes due April 23, 2024
Effective Rate	0.596%		0.596%
Principal	$ 700,000		$ 700,000
Unamortized Costs	(1,804)		(1,804)
Book Value	698,196		698,196
Fair Value	$ 704,200		$ 704,200
U.S. Dollar Denominated Unsecured Debt | Notes due February 15, 2026
Coupon Rate	0.875%		0.875%	0.875%
Effective Rate	1.03%		1.03%
Principal	$ 500,000		$ 500,000
Unamortized Costs	(3,246)		(3,246)
Book Value	496,754		496,754
Fair Value	$ 493,515		$ 493,515
U.S. Dollar Denominated Unsecured Debt | Notes due September 15, 2027
Coupon Rate	3.094%		3.094%
Effective Rate	3.218%		3.218%
Principal	$ 500,000		$ 500,000
Unamortized Costs	(3,152)		(3,152)
Book Value	496,848		496,848		496,452
Fair Value	$ 546,757		$ 546,757		560,833
U.S. Dollar Denominated Unsecured Debt | Notes due May 1, 2028
Coupon Rate	1.85%	1.85%	1.85%
Effective Rate	1.962%		1.962%
Principal	$ 650,000		$ 650,000
Unamortized Costs	(4,446)		(4,446)
Book Value	645,554		645,554
Fair Value	$ 653,619		$ 653,619
U.S. Dollar Denominated Unsecured Debt | Notes due May 1, 2029
Coupon Rate	3.385%		3.385%
Effective Rate	3.459%		3.459%
Principal	$ 500,000		$ 500,000
Unamortized Costs	(2,334)		(2,334)
Book Value	497,666		497,666		497,433
Fair Value	$ 549,252		$ 549,252		574,833
U.S. Dollar Denominated Unsecured Debt | Notes due May 1, 2031
Coupon Rate	2.30%	2.30%	2.30%
Effective Rate	2.419%		2.419%
Principal	$ 650,000		$ 650,000
Unamortized Costs	(6,554)		(6,554)
Book Value	643,446		643,446
Fair Value	658,400		658,400
Euro Denominated Unsecured Debt
Principal	1,787,132		1,787,132
Unamortized Costs	(15,538)		(15,538)
Book Value	1,771,594		1,771,594		1,026,768
Fair Value	$ 1,801,392		$ 1,801,392		1,087,133
Euro Denominated Unsecured Debt | Notes due April 12, 2024
Coupon Rate	1.54%		1.54%
Effective Rate	1.54%		1.54%
Principal	$ 115,896		$ 115,896
Unamortized Costs	0		0
Book Value	115,896		115,896		122,646
Fair Value	$ 120,868		$ 120,868		129,192
Euro Denominated Unsecured Debt | Notes due November 3, 2025
Coupon Rate	2.175%		2.175%
Effective Rate	2.175%		2.175%
Principal	$ 280,484		$ 280,484
Unamortized Costs	0		0
Book Value	280,484		280,484		296,821
Fair Value	$ 303,644		$ 303,644		323,552
Euro Denominated Unsecured Debt | Notes due September 9, 2030
Coupon Rate	0.50%		0.50%
Effective Rate	0.64%		0.64%
Principal	$ 811,272		$ 811,272
Unamortized Costs	(10,010)		(10,010)
Book Value	801,262		801,262
Fair Value	$ 795,777		$ 795,777
Euro Denominated Unsecured Debt | Notes due January 24, 2032
Coupon Rate	0.875%		0.875%
Effective Rate	0.978%		0.978%
Principal	$ 579,480		$ 579,480
Unamortized Costs	(5,528)		(5,528)
Book Value	573,952		573,952		607,301
Fair Value	581,103		$ 581,103		634,389
Mortgage Debt
Number of real estate facilities securing debt | company			27
Net book value of real estate facilities securing notes payable	$ 96,600		$ 96,600
Coupon Rate	3.905%		3.905%
Effective Rate	3.903%		3.903%
Principal	$ 23,627		$ 23,627
Unamortized Costs	0		0
Book Value	23,627		23,627		25,230
Fair Value	$ 24,939		$ 24,939		$ 26,958
SOFR | U.S. Dollar Denominated Unsecured Debt | Notes due April 23, 2024
Interest rate spread	0.47%	0.47%

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