Notes Receivable, Net (Descriptors) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Pier Park Community Development District notes, non-interest bearing, due September 2022, net of unamortized discount of $0.1 million, effective rates 5.93% — 6.50%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized discount	$ 0.1	$ 0.1
Pier Park Community Development District notes, non-interest bearing, due September 2022, net of unamortized discount of $0.1 million, effective rates 5.93% — 6.50% | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, effective interest rate	5.93%	5.93%
Pier Park Community Development District notes, non-interest bearing, due September 2022, net of unamortized discount of $0.1 million, effective rates 5.93% — 6.50% | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, effective interest rate	6.50%	6.50%
Interest bearing homebuilder notes, secured by the real estate sold — 4.0% interest rate, any remaining payments outstanding are due December 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, effective interest rate	4.00%	4.00%