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Commitments and Contingencies (Details) $ in Thousands	1 Months Ended			2 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) case	Dec. 17, 2019 plaintiff	Jun. 30, 2016 USD ($)	Oct. 21, 2020 case	Jul. 31, 2018 case	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2020 USD ($)	Mar. 23, 2017 case
Loss Contingencies [Line Items]
Investment in parcels	$ 680,871					$ 601,700	$ 680,871		$ 658,678
Purchases of land						$ 57,660	$ 71,639
Land
Loss Contingencies [Line Items]
Purchases of land			$ 70,300
Land | Sagamore
Loss Contingencies [Line Items]
Investment in parcels								$ 72,000
Purchases of land								35,000
Payment for lease termination								30,600
Development costs								$ 6,400
Under Armour Securities Litigation, Case No. 17-cv-00388-RDB | Pending Litigation
Loss Contingencies [Line Items]
Pending claims | case										3
Securities Class Actions
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff		2
Derivative Complaints
Loss Contingencies [Line Items]
Number of complaints | case	2			3	2

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