Revenue Recognition (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 204,320,000	$ 185,680,000	$ 407,048,000	$ 372,578,000
Reduction of revenue related to write-down of net assets associated with lease	1,600,000		1,600,000
Rental property revenues
Disaggregation of Revenue [Line Items]
Revenues	203,954,000	183,174,000	404,030,000	366,401,000
Variable rental revenue	62,200,000	50,200,000	121,400,000	103,000,000
Fees and other
Disaggregation of Revenue [Line Items]
Revenues	366,000	2,500,000	3,000,000	6,200,000
Fees and other | Norfolk Southern
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 1,400,000	$ 0	$ 2,200,000