Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	$ 1,941,610
Proceeds	495,145	$ 295,620
Lump sum payoffs	(91,500)	(95,500)
Scheduled principal repayments	(3,873)
Amortization of premiums/ discounts	1,191	$ 16,426
Amortization of deferred financing costs, net	(1,816)
Mortgage notes payable, net ending balance	2,340,757
Fixed Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	1,574,699
Proceeds	495,000
Lump sum payoffs	(91,500)
Scheduled principal repayments	(3,873)
Amortization of premiums/ discounts	571
Amortization of deferred financing costs, net	(2,035)
Mortgage notes payable, net ending balance	1,972,862
Floating Rate Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	366,911
Proceeds	145
Amortization of premiums/ discounts	620
Amortization of deferred financing costs, net	219
Mortgage notes payable, net ending balance	367,895
Floating Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	7,050
Proceeds	145
Amortization of deferred financing costs, net	120
Mortgage notes payable, net ending balance	7,315
Floating Rate Debt [Member] | Secured – Tax Exempt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	359,861
Amortization of premiums/ discounts	620
Amortization of deferred financing costs, net	99
Mortgage notes payable, net ending balance	$ 360,580