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Notes Payable (Schedule of Notes Payable) (Details) $ in Thousands	Sep. 30, 2023 USD ($) real_estate_facility	Jul. 26, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Principal	$ 9,082,450
Unamortized Costs	(52,828)
Book Value	9,029,622		$ 6,870,826
Fair Value	8,029,754		5,958,083
Notes due July 25, 2025
Debt Instrument [Line Items]
Principal		$ 400,000
Notes due January 15, 2029
Debt Instrument [Line Items]
Coupon Rate		5.125%
Principal		$ 500,000
Notes due August 1, 2033
Debt Instrument [Line Items]
Coupon Rate		5.10%
Principal		$ 700,000
Notes due August 1, 2053
Debt Instrument [Line Items]
Coupon Rate		5.35%
Principal		$ 600,000
Secured Overnight Financing Rate (SOFR) | Notes due July 25, 2025
Debt Instrument [Line Items]
Interest rate spread (as percent)		0.60%
U.S. Dollar Denominated Unsecured Debt
Debt Instrument [Line Items]
Principal	7,450,000
Unamortized Costs	(40,601)
Book Value	7,409,399		5,223,709
Fair Value	$ 6,716,521		4,635,551
U.S. Dollar Denominated Unsecured Debt | Notes due April 23, 2024
Debt Instrument [Line Items]
Effective Rate	5.791%
Principal	$ 700,000
Unamortized Costs	(397)
Book Value	699,603		699,075
Fair Value	$ 699,950		691,309
U.S. Dollar Denominated Unsecured Debt | Notes due July 25, 2025
Debt Instrument [Line Items]
Effective Rate	5.932%
Principal	$ 400,000
Unamortized Costs	(1,481)
Book Value	398,519		0
Fair Value	$ 400,277		0
U.S. Dollar Denominated Unsecured Debt | Notes due February 15, 2026
Debt Instrument [Line Items]
Coupon Rate	0.875%
Effective Rate	1.03%
Principal	$ 500,000
Unamortized Costs	(1,766)
Book Value	498,234		497,678
Fair Value	$ 448,646		441,849
U.S. Dollar Denominated Unsecured Debt | Notes due November 9, 2026
Debt Instrument [Line Items]
Coupon Rate	1.50%
Effective Rate	1.64%
Principal	$ 650,000
Unamortized Costs	(2,704)
Book Value	647,296		646,643
Fair Value	$ 580,053		578,899
U.S. Dollar Denominated Unsecured Debt | Notes due September 15, 2027
Debt Instrument [Line Items]
Coupon Rate	3.094%
Effective Rate	3.218%
Principal	$ 500,000
Unamortized Costs	(2,096)
Book Value	497,904		497,508
Fair Value	$ 460,565		466,029
U.S. Dollar Denominated Unsecured Debt | Notes due May 1, 2028
Debt Instrument [Line Items]
Coupon Rate	1.85%
Effective Rate	1.962%
Principal	$ 650,000
Unamortized Costs	(3,091)
Book Value	646,909		646,401
Fair Value	$ 556,154		558,197
U.S. Dollar Denominated Unsecured Debt | Notes due November 9, 2028
Debt Instrument [Line Items]
Coupon Rate	1.95%
Effective Rate	2.044%
Principal	$ 550,000
Unamortized Costs	(2,457)
Book Value	547,543		547,182
Fair Value	$ 465,373		468,509
U.S. Dollar Denominated Unsecured Debt | Notes due January 15, 2029
Debt Instrument [Line Items]
Coupon Rate	5.125%
Effective Rate	5.26%
Principal	$ 500,000
Unamortized Costs	(3,093)
Book Value	496,907		0
Fair Value	$ 491,674		0
U.S. Dollar Denominated Unsecured Debt | Notes due May 1, 2029
Debt Instrument [Line Items]
Coupon Rate	3.385%
Effective Rate	3.459%
Principal	$ 500,000
Unamortized Costs	(1,714)
Book Value	498,286		498,053
Fair Value	$ 450,606		456,855
U.S. Dollar Denominated Unsecured Debt | Notes due May 1, 2031
Debt Instrument [Line Items]
Coupon Rate	2.30%
Effective Rate	2.419%
Principal	$ 650,000
Unamortized Costs	(5,183)
Book Value	644,817		644,303
Fair Value	$ 517,832		530,390
U.S. Dollar Denominated Unsecured Debt | Notes due November 9, 2031
Debt Instrument [Line Items]
Coupon Rate	2.25%
Effective Rate	2.322%
Principal	$ 550,000
Unamortized Costs	(2,872)
Book Value	547,128		546,866
Fair Value	$ 429,370		443,514
U.S. Dollar Denominated Unsecured Debt | Notes due August 1, 2033
Debt Instrument [Line Items]
Coupon Rate	5.10%
Effective Rate	5.207%
Principal	$ 700,000
Unamortized Costs	(5,697)
Book Value	694,303		0
Fair Value	$ 669,161		0
U.S. Dollar Denominated Unsecured Debt | Notes due August 1, 2053
Debt Instrument [Line Items]
Coupon Rate	5.35%
Effective Rate	5.442%
Principal	$ 600,000
Unamortized Costs	(8,050)
Book Value	591,950		0
Fair Value	$ 546,860		0
U.S. Dollar Denominated Unsecured Debt | Secured Overnight Financing Rate (SOFR) | Notes due April 23, 2024
Debt Instrument [Line Items]
Interest rate spread (as percent)	0.47%
U.S. Dollar Denominated Unsecured Debt | Secured Overnight Financing Rate (SOFR) | Notes due July 25, 2025
Debt Instrument [Line Items]
Interest rate spread (as percent)	0.60%
Euro Denominated Unsecured Debt
Debt Instrument [Line Items]
Principal	$ 1,630,587
Unamortized Costs	(12,227)
Book Value	1,618,360		1,637,025
Fair Value	$ 1,311,580		1,312,964
Euro Denominated Unsecured Debt | Notes due April 12, 2024
Debt Instrument [Line Items]
Coupon Rate	1.54%
Effective Rate	1.54%
Principal	$ 105,744
Unamortized Costs	0
Book Value	105,744		107,035
Fair Value	$ 103,939		104,344
Euro Denominated Unsecured Debt | Notes due November 3, 2025
Debt Instrument [Line Items]
Coupon Rate	2.175%
Effective Rate	2.175%
Principal	$ 255,915
Unamortized Costs	0
Book Value	255,915		259,039
Fair Value	$ 244,650		246,119
Euro Denominated Unsecured Debt | Notes due September 9, 2030
Debt Instrument [Line Items]
Coupon Rate	0.50%
Effective Rate	0.64%
Principal	$ 740,208
Unamortized Costs	(7,771)
Book Value	732,437		740,634
Fair Value	$ 566,585		566,204
Euro Denominated Unsecured Debt | Notes due January 24, 2032
Debt Instrument [Line Items]
Coupon Rate	0.875%
Effective Rate	0.978%
Principal	$ 528,720
Unamortized Costs	(4,456)
Book Value	524,264		530,317
Fair Value	$ 396,406		396,297
Mortgage Debt
Debt Instrument [Line Items]
Number of real estate facilities securing debt | real_estate_facility	2
Net book value of real estate facilities securing notes payable	$ 11,700
Coupon Rate	4.414%
Effective Rate	4.414%
Principal	$ 1,863
Unamortized Costs	0
Book Value	1,863		10,092
Fair Value	$ 1,653		$ 9,568

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