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Commitments and Contingencies (Details) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jul. 31, 2018 plaintiff | Mar. 31, 2015 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Oct. 19, 2018 case | Mar. 23, 2017 case | Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Investment in parcels |  |  |  | $ 680,871 | $ 778,894 | $ 792,148 |  |  |
Purchases of land |  |  |  | $ 71,639 | $ 105,767 |  |  |  |
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] |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  | 3 |  |  |  |  |  |  |
Pending claims | case |  |  |  |  |  |  | 2 |  |

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