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Related Party Arrangements (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Arrangements |  |  |
Management, development and other fees | $ 3,819,000 | $ 4,960,000 | $ 3,572,000
Compensation expense | 21,110,000 | 24,885,000 | 19,707,000
Unconsolidated Real Estate Entities [Member] |  |  |
Related Party Arrangements |  |  |
Outstanding receivables | 5,408,000 | 3,924,000 |
Non-employee directors |  |  |
Related Party Arrangements |  |  |
Payable to related parties | 90,000 |  |
Payable to related parties in quarterly installments | 22,500 |  |
Non-employee directors | Restricted stock and deferred stock awards |  |  |
Related Party Arrangements |  |  |
Payable to related parties | 170,000 |  |
Compensation expense | 1,819,000 | 1,725,000 | 1,624,000
Amount of deferred compensation | 614,000 | $ 594,000 | $ 571,000
Lead Independent Director |  |  |
Related Party Arrangements |  |  |
Payable to related parties | 30,000 |  |
Payable to related parties in quarterly installments | 7,500 |  |
Non Employee Director Serving As A Chairperson of the Audit Committee [Member] |  |  |
Related Party Arrangements |  |  |
Payable to related parties | 25,000 |  |
Payable to related parties in quarterly installments | 6,250 |  |
Non Employee Director Serving As A Chairperson of the Compensation Committee [Member] |  |  |
Related Party Arrangements |  |  |
Payable to related parties | 20,000 |  |
Payable to related parties in quarterly installments | 5,000 |  |
Non Employee Director Serving As A Chairperson of the Nominating and Corporate Governance or Investment and Finance Committees |  |  |
Related Party Arrangements |  |  |
Payable to related parties | 15,000 |  |
Payable to related parties in quarterly installments | $ 3,750 |  |

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