Debt - Schedule of Debt (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Debt [Roll Forward]
Total debt, Beginning balance	$ 5,913,065
Debt Issuances	192,000
Repayments, Extinguishment and Assumptions, Net	(446,084)
Accretion and Amortization, Net	7,071
Total debt, Ending balance	5,666,052
Mortgages [Member]
Debt [Roll Forward]
Outstanding balance, Beginning balance	1,333,195
Net premiums (discounts), Beginning balance	1,495
Deferred costs, Beginning balance	(5,855)
Total debt, Beginning balance	1,328,835
Repayments, Extinguishment and Assumptions	(341,392)
Repayments, Extinguishment and Assumptions of Debt, net premiums (discounts)	(1,041)
Repayments, Extinguishment and Assumptions of Debt, Deferred costs	349
Repayments, Extinguishment and Assumptions, Net	(342,084)
Accretion and Amortization	(558)
Accretion and Amortization, Deferred costs	1,511
Accretion and Amortization, Net	953
Outstanding balance, Ending balance	991,803
Net premiums (discounts), Ending balance	(104)
Deferred costs, Ending balance	(3,995)
Total debt, Ending balance	987,704
Corporate Bonds [Member]
Debt [Roll Forward]
Outstanding balance, Beginning balance	4,650,000
Net premiums (discounts), Beginning balance	(27,049)
Deferred costs, Beginning balance	(38,721)
Total debt, Beginning balance	4,584,230
Accretion and Amortization	2,257
Accretion and Amortization, Deferred costs	3,861
Accretion and Amortization, Net	6,118
Outstanding balance, Ending balance	4,650,000
Net premiums (discounts), Ending balance	(24,792)
Deferred costs, Ending balance	(34,860)
Total debt, Ending balance	4,590,348
Credit Facility [Member]
Debt [Roll Forward]
Total debt, Beginning balance	0
Debt Issuances	192,000
Repayments, Extinguishment and Assumptions, Net	(104,000)
Accretion and Amortization, Net	0
Total debt, Ending balance	$ 88,000