Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	$ 1,941,610
Proceeds	78	$ 288,120
Scheduled principal repayments	(1,941)
Amortization of premiums/ discounts	595	$ 736
Amortization of deferred financing costs, net	403
Mortgage notes payable, net ending balance	1,940,745
Fixed Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	1,574,699
Scheduled principal repayments	(1,941)
Amortization of premiums/ discounts	285
Amortization of deferred financing costs, net	293
Mortgage notes payable, net ending balance	1,573,336
Floating Rate Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	366,911
Proceeds	78
Amortization of premiums/ discounts	310
Amortization of deferred financing costs, net	110
Mortgage notes payable, net ending balance	367,409
Floating Rate Debt [Member] | Secured – Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	7,050
Proceeds	78
Amortization of deferred financing costs, net	60
Mortgage notes payable, net ending balance	7,188
Floating Rate Debt [Member] | Secured – Tax Exempt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	359,861
Amortization of premiums/ discounts	310
Amortization of deferred financing costs, net	50
Mortgage notes payable, net ending balance	$ 360,221