Real Estate - Assets and Liabilities Held-for-sale (Details) - USD ($) $ in Thousands			6 Months Ended
	Jul. 23, 2021	Apr. 07, 2021	Jun. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Held-for-sale | One South Plaza
Real estate assets and other assets held for sale
Operating property, net of accumulated depreciation of $25,902 and $8,123 in 2021 and 2020, respectively				$ 247,034
Notes and accounts receivable				398
Deferred rents receivable				3,359
Intangible assets, net of accumulated amortization of $12,326 and $6,065 in 2021 and 2020, respectively				9,228
Other assets				228
Total real estate assets and other assets held for sale				260,247
Liabilities of real estate assets held for sale
Accounts payable and accrued expenses				2,985
Deferred income				110
Intangible liabilities, net of accumulated amortization of $4,512 and $1,205 in 2021 and 2020, respectively				6,527
Other liabilities				1,260
Total liabilities of real estate assets held for sale				10,882
Operating properties, net of accumulated depreciation				25,902
Intangible assets, net of accumulated amortization				12,326
Intangible liabilities, net of accumulated amortization				$ 4,512
Held-for-sale | Burnett Plaza
Real estate assets and other assets held for sale
Operating property, net of accumulated depreciation of $25,902 and $8,123 in 2021 and 2020, respectively					$ 106,864
Notes and accounts receivable					439
Deferred rents receivable					2,480
Intangible assets, net of accumulated amortization of $12,326 and $6,065 in 2021 and 2020, respectively					15,830
Other assets					133
Total real estate assets and other assets held for sale					125,746
Liabilities of real estate assets held for sale
Accounts payable and accrued expenses					7,399
Deferred income					44
Intangible liabilities, net of accumulated amortization of $4,512 and $1,205 in 2021 and 2020, respectively					3,014
Other liabilities					2,149
Total liabilities of real estate assets held for sale					12,606
Operating properties, net of accumulated depreciation					8,123
Intangible assets, net of accumulated amortization					6,065
Intangible liabilities, net of accumulated amortization					$ 1,205
Discontinued Operations, Disposed of by Sale
Liabilities of real estate assets held for sale
Gain from sale of property			$ 90,300
Discontinued Operations, Disposed of by Sale | One South Plaza | Subsequent Event
Liabilities of real estate assets held for sale
Sales Price	$ 271,500
Gain from sale of property	$ 13,000
Discontinued Operations, Disposed of by Sale | Burnett Plaza
Liabilities of real estate assets held for sale
Sales Price		$ 137,500
Gain from sale of property		$ (19)