Debt (Descriptors) (Details)	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt interest rate			4.80%
Construction loan | Refinanced loan in the Pier Park North joint venture, due November 2025, bearing interest at 4.1%
Debt Instrument [Line Items]
Debt interest rate	4.10%	4.10%
Minimum | Secured debt | Community Development District debt, secured by certain real estate and standby note purchase agreements, due May 2031 - May 2039, bearing interest at 3.1% to 7.0% at June 30, 2016 and 2.8% to 7.0% at December 31, 2015
Debt Instrument [Line Items]
Debt interest rate	3.10%	2.80%
Maximum | Secured debt | Community Development District debt, secured by certain real estate and standby note purchase agreements, due May 2031 - May 2039, bearing interest at 3.1% to 7.0% at June 30, 2016 and 2.8% to 7.0% at December 31, 2015
Debt Instrument [Line Items]
Debt interest rate	7.00%	7.00%