Summary of Significant Accounting Policies - Schedule of variable interest entities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Assets	$ 9,228,348	$ 8,853,571
Liabilities	6,539,789	6,022,601
Operating Partnership
Variable Interest Entity [Line Items]
Assets	275,099	284,120
Liabilities	239,121	251,241
Operating Partnership | Property, net
Variable Interest Entity [Line Items]
Assets	254,415	254,071
Operating Partnership | Other assets
Variable Interest Entity [Line Items]
Assets	20,684	30,049
Operating Partnership | Mortgage notes payable
Variable Interest Entity [Line Items]
Liabilities	219,186	219,140
Operating Partnership | Other liabilities
Variable Interest Entity [Line Items]
Liabilities	$ 19,935	$ 32,101