Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	$ 2,293,890
Proceeds	47,759	$ 495,145
Lump sum payoffs	(59,880)	(91,500)
Scheduled principal repayments	(3,713)
Amortization of premiums/ discounts	1,374	$ 1,191
Amortization of deferred financing costs, net	821
Mortgage notes payable, net ending balance	2,280,251
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	(3,713)
Amortization of premiums/ discounts	758
Amortization of deferred financing costs, net	354
Mortgage notes payable, net ending balance	1,898,790
Floating Rate Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	392,799
Proceeds	19,259
Lump sum payoffs	(31,680)
Amortization of premiums/ discounts	616
Amortization of deferred financing costs, net	467
Mortgage notes payable, net ending balance	381,461
Floating Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	31,494
Proceeds	19,259
Amortization of deferred financing costs, net	120
Mortgage notes payable, net ending balance	50,873
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	616
Amortization of deferred financing costs, net	347
Mortgage notes payable, net ending balance	$ 330,588