Debt - Schedule of Debt (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Debt [Roll Forward]
Total debt, Beginning balance	$ 5,913,065
Debt Issuances, Net	0
Repayments, Extinguishment and Assumptions, Net	(293,458)
Accretion and Amortization, Net	1,973
Total debt, Ending balance	5,621,580
Mortgages [Member]
Debt [Roll Forward]
Outstanding balance, Beginning balance	1,333,195
Net premiums (discount), Beginning balance	1,495
Deferred costs, Beginning balance	(5,855)
Total debt, Beginning balance	1,328,835
Debt Issuances	0
Debt Issuances, Deferred costs	0
Debt Issuances, Net	0
Repayments, Extinguishment and Assumptions	(292,806)
Repayments, Extinguishment and Assumptions of Debt, Premium (Discount)	(1,005)
Repayments, Extinguishment and Assumptions of Debt, Deferred costs	353
Repayments, Extinguishment and Assumptions, Net	(293,458)
Accretion and Amortization	(493)
Accretion and Amortization, Deferred costs	444
Accretion and Amortization, Net	(49)
Outstanding balance, Ending balance	1,040,389
Net premiums (discount), Ending balance	(3)
Deferred costs, Ending balance	(5,058)
Total debt, Ending balance	1,035,328
Corporate Bonds [Member]
Debt [Roll Forward]
Outstanding balance, Beginning balance	4,650,000
Net premiums (discount), Beginning balance	(27,049)
Deferred costs, Beginning balance	(38,721)
Total debt, Beginning balance	4,584,230
Debt Issuances	0
Debt Issuance, Discount	0
Debt Issuances, Deferred costs	0
Debt Issuances, Net	0
Accretion and Amortization	747
Accretion and Amortization, Deferred costs	1,275
Accretion and Amortization, Net	2,022
Outstanding balance, Ending balance	4,650,000
Net premiums (discount), Ending balance	(26,302)
Deferred costs, Ending balance	(37,446)
Total debt, Ending balance	$ 4,586,252