Real Estate Joint Ventures - Consolidated Real Estate Joint Ventures (Details) - item	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Apr. 30, 2017
Origins Crossings JV
Variable interest entity
Number of units	217
Variable interest entity, ownership percentage	75.00%
Pier Park Crossings JV
Variable interest entity
Number of units			240
Variable interest entity, ownership percentage	75.00%	75.00%
Windmark JV
Variable interest entity
Variable interest entity, ownership percentage	49.00%	49.00%
Pier Park North
Variable interest entity
Variable interest entity, ownership percentage	60.00%	60.00%