Leases - Rental Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Cash rent	$ 269,583	$ 282,575
Straight-line rent	2,055	7,412
Lease intangible amortization	(748)	(731)
Property operating cost reimbursements	1,428	1,464
Sub-lease	5,263	5,489
Total fixed	277,581	296,209
Variable	20,815	20,417
Income from direct financing leases	190	217
Total rental revenue	$ 298,586	$ 316,843

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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