Commitments and Contingencies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) entities	Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items]
Guaranteed Repayment of Economic Development Bonds	$ 34,000
Number of unconsolidated subsidiaries for which loans guaranteed | entities	2
Maximum Guarantee Exposure for Joint Venture Loans	$ 90,300
Total obligation for operating leases for certain land positions	306,500
Other Liabilities	106,283	$ 95,566
Special Tax Assessment [Member]
Loss Contingencies [Line Items]
Other Liabilities	$ 11,100