Debt - Schedule of Debt (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Debt [Roll Forward]
Total debt, Beginning balance	$ 5,913,065
Repayments, Extinguishment and Assumptions, Net	(326,777)
Accretion and Amortization, Net	4,494
Total debt, Ending balance	5,590,782
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
Repayments, Extinguishment and Assumptions	(326,087)
Repayments, Extinguishment and Assumptions of Debt, Premium (Discount)	(1,043)
Repayments, Extinguishment and Assumptions of Debt, Deferred costs	353
Repayments, Extinguishment and Assumptions, Net	(326,777)
Accretion and Amortization	(534)
Accretion and Amortization, Deferred costs	972
Accretion and Amortization, Net	438
Outstanding balance, Ending balance	1,007,108
Net premiums (discount), Ending balance	(82)
Deferred costs, Ending balance	(4,530)
Total debt, Ending balance	1,002,496
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
Accretion and Amortization	1,497
Accretion and Amortization, Deferred costs	2,559
Accretion and Amortization, Net	4,056
Outstanding balance, Ending balance	4,650,000
Net premiums (discount), Ending balance	(25,552)
Deferred costs, Ending balance	(36,162)
Total debt, Ending balance	$ 4,588,286