Commitments and Contingencies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) entities	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Guaranteed Repayment of Economic Development Bonds	$ 22,000
Number of unconsolidated subsidiaries for which loans guaranteed | entities	1
Maximum Guarantee Exposure for Joint Venture Loans	$ 55,400
Other Liabilities	223,680	$ 205,433
Special Tax Assessment [Member]
Loss Contingencies [Line Items]
Other Liabilities	1,000
Land [Member]
Loss Contingencies [Line Items]
Total obligation for operating leases	90,200
Office [Member]
Loss Contingencies [Line Items]
Total obligation for operating leases	$ 35,400