Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	$ 2,293,890
Proceeds	51,298	$ 505,375
Lump sum payoffs	(59,880)	(127,767)
Scheduled principal repayments	(5,570)
Amortization of premiums/ discounts	2,069	$ 1,791
Amortization of deferred financing costs, net	(642)
Mortgage notes payable, net ending balance	2,281,165
Fixed Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	1,901,091
Proceeds	28,500
Lump sum payoffs	(28,200)
Scheduled principal repayments	(5,570)
Amortization of premiums/ discounts	1,140
Amortization of deferred financing costs, net	689
Mortgage notes payable, net ending balance	1,897,650
Floating Rate Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	392,799
Proceeds	22,798
Lump sum payoffs	(31,680)
Amortization of premiums/ discounts	929
Amortization of deferred financing costs, net	(1,331)
Mortgage notes payable, net ending balance	383,515
Floating Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	31,494
Proceeds	22,798
Amortization of deferred financing costs, net	(1,719)
Mortgage notes payable, net ending balance	52,573
Floating Rate Debt [Member] | Secured – Tax Exempt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	361,305
Lump sum payoffs	(31,680)
Amortization of premiums/ discounts	929
Amortization of deferred financing costs, net	388
Mortgage notes payable, net ending balance	$ 330,942