Commitments and Contingencies (Details)	1 Months Ended	12 Months Ended
	Jan. 31, 2021 USD ($) entities loans	Dec. 31, 2020 USD ($) entities	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Guaranteed Repayment of Economic Development Bonds		$ 20,100,000
Number of unconsolidated subsidiaries for which loans guaranteed | entities		2
Maximum Guarantee Exposure for Joint Venture Loans		$ 81,300,000
Number of unconsolidated joint ventures in which equity interests held | entities		9
Other Liabilities		$ 269,806,000	$ 223,680,000
Subsequent Event [Member]
Loss Contingencies [Line Items]
Extinguishment of Debt, Amount	$ 69,800,000
Loans Payable [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Number of unconsolidated joint ventures in which equity interests held | entities	1
Number of Guaranteed Loans | loans	1
Special Tax Assessment [Member]
Loss Contingencies [Line Items]
Other Liabilities		961,000
Land [Member]
Loss Contingencies [Line Items]
Future Minimum Payments Due		225,200,000
Office [Member]
Loss Contingencies [Line Items]
Total obligation for operating leases		$ 27,900,000