Leases - Rental Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Cash rent	$ 263,342	$ 269,583
Straight-line rent	4,219	2,055
Lease intangible amortization	(1,547)	(748)
Property operating cost reimbursements	1,387	1,428
Sub-lease	4,969	5,263
Total fixed	272,370	277,581
Variable	17,806	20,815
Income from direct financing leases	133	190
Total rental revenue	$ 290,309	$ 298,586

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of lease income from variable lease payments, interest income on direct financing lease and after offset of loss recognized at commencement.

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Amount of direct financing lease revenue.

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Difference between actual rental income due and rental income recognized on a straight-line basis.

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Amount of sublease income excluding finance and operating lease expense.

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Direct Financing Lease, Cash Rent

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