Summary of Significant Accounting Policies - Schedule of variable interest entities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Assets	$ 9,299,648	$ 8,853,571
Liabilities	6,575,288	6,022,601
Operating Partnership
Variable Interest Entity [Line Items]
Assets	281,258	284,120
Liabilities	245,527	251,241
Operating Partnership | Property, net
Variable Interest Entity [Line Items]
Assets	254,911	254,071
Operating Partnership | Other assets
Variable Interest Entity [Line Items]
Assets	26,347	30,049
Operating Partnership | Mortgage notes payable
Variable Interest Entity [Line Items]
Liabilities	219,163	219,140
Operating Partnership | Other liabilities
Variable Interest Entity [Line Items]
Liabilities	$ 26,364	$ 32,101