Other Assets and Liabilities (Prepaid Expenses and Other Assets) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Other Assets and Liabilities [Line Items]
Special Improvement District receivable	$ 89,677	$ 54,770
Special Improvement District receivable, Change	34,907
Security, escrow and other deposits	45,425	48,576
Security, escrow, and other deposits, Change	(3,151)
Intangibles	30,571	32,595
Intangibles, Change	(2,024)
Prepaid expenses	28,597	17,455
Prepaid expenses, Change	11,142
Condominium inventory	18,473	55,883
Condominium inventory, Change	(37,410)
Tenant incentives and other receivables	7,115	9,612
Tenant incentives and other receivables, Change	(2,497)
Other	7,053	12,096
Other, Change	(5,043)
Food and beverage and lifestyle inventory	1,035	1,060
Food and beverage and lifestyle inventory, Change	(25)
TIF receivable	751	893
TIF receivable, Change	(142)
Prepaid expenses and other assets, net	274,097	282,101
Prepaid expenses and other assets, net, Change	(8,004)
1201 Lake Robbins and the Woodlands Warehouse
Other Assets and Liabilities [Line Items]
Decrease in Security, escrow and other deposits	29,500
Bridgeland
Other Assets and Liabilities [Line Items]
Security, escrow and other deposits	27,500
In-place leases
Other Assets and Liabilities [Line Items]
In-place leases	45,400	$ 49,161
In-place leases, Change	$ (3,761)