Investments In and Advances To Affiliates (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) ft²	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%
Difference between cost of investments and the net book value of underlying net assets	$ 600	$ 600
Rentable square feet of office property under development (in sq feet) | ft²	600,000
Development, management and leasing fees recognized from unconsolidated affiliates	$ 1,600	1,000	$ 500
Receivables from management and leasing fees		200
Consolidated Affiliates:
Gains on disposition of property	$ 174,059	$ 215,897	$ 39,517
Plaza Colonnade, Tenant-in-Common [Member]
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%
Brand/HRLP 2827 Peachtree LLC
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%
Rentable square feet of office property under development (in sq feet) | ft²	135,000
Total anticipated development costs	$ 79,000
Contribution of cash to acquire interest in joint venture	13,300
Cash funded to acquire interest in joint venture	6,100
Partner's contribution of property to acquire interest in joint venture	7,700
Contribution of cash from affiliate	$ 5,600
Partner's percentage of equity interest in joint venture (in hundredths)	50.00%
Advance to affiliate	$ 49,600
Term of optional extension	1 year
Interest rate, basis spread (in hundredths)	3.00%
Amount of loan funded to affiliate	$ 0
Risk of loss for variable interest entity	$ 6,100
Brand/HRLP 2827 Peachtree LLC | London Interbank Offered Rate (LIBOR) [Member]
Unconsolidated Affiliates:
Interest rate basis	LIBOR
Kessinger/Hunter & Company, LC [Member]
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	26.50%
Highwoods-Markel Associates, LLC Joint Venture [Member]
Consolidated Affiliates:
Percentage of equity interest in consolidated affiliates	50.00%
Fair value of noncontrolling interests in consolidated affiliate	$ 31,100
Sale price of disposition	3,000
Gains on disposition of property	$ 1,300