Leases - Rental Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Cash rent	$ 264,466	$ 255,996	$ 799,943	$ 778,697
Straight-line rent	3,560	12,595	12,392	18,053
Lease intangible amortization	(1,164)	(393)	(4,541)	(1,929)
Property operating cost reimbursements	1,373	1,581	4,045	4,372
Sub-lease	4,898	5,175	14,623	15,718
Total fixed	273,133	274,954	826,462	814,911
Variable	16,422	18,585	43,711	55,438
Income from direct financing leases	116	153	374	505
Total rental revenue	$ 289,671	$ 293,692	$ 870,547	$ 870,854

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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