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Commitments and Contingencies (Details) $ in Thousands	1 Months Ended	2 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jul. 31, 2018 plaintiff	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2019 USD ($)	Oct. 19, 2018 case	Mar. 23, 2017 case
Loss Contingencies [Line Items]
Investment in parcels			$ 702,885	$ 795,499		$ 792,148
Purchases of land			$ 50,862	$ 77,046
Land | Sagamore
Loss Contingencies [Line Items]
Investment in parcels					$ 72,000
Purchases of land	$ 70,300				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
Derivative Complaints | Pending Litigation
Loss Contingencies [Line Items]
Pending claims | case							2
Number of plaintiffs | plaintiff		3

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