Summary of Significant Accounting Policies - Lease Accounting (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Mar. 31, 2020	Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]
Operating lease liabilities		$ 1,431,292	$ 693,539
Operating Lease, Right-of-Use Asset		1,364,621	628,681
Notes And Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Rent receivable, net of allowance		$ 399,700	$ 171,900
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Lease, Practical Expedients, Package [true false]	true
Lease, Practical Expedient, Land Easement [true false]	true
Lease, Practical Expedient, Lessor Single Lease Component [true false]	true
Accumulated dividends in excess of earnings	$ 6,300
Amount reclassified from deferred rent liabilities to operating lease liabilities under ASC 842	73,300
Operating lease liabilities	757,200
Operating Lease, Right-of-Use Asset	$ 683,900