Schedule III (Consolidated) - Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 55,630
Initial Cost to Company, Land & Improvements	160,945
Initial Cost to Company, Buildings & Improvements	157,053
Costs Capitalized Subsequent to Acquisition or Construction	86,378
Land & Land Improvements	252,104
Buildings and Improvements	152,272
Total	404,376	$ 381,969	$ 377,668	$ 379,944
Accumulated Depreciation	71,752	$ 67,349
Aggregate cost of real estate owned for federal income tax purposes	431,700
Residential developments
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	1,928
Initial Cost to Company, Land & Improvements	48,430
Initial Cost to Company, Buildings & Improvements	10,954
Costs Capitalized Subsequent to Acquisition or Construction	48,239
Land & Land Improvements	106,163
Buildings and Improvements	1,460
Total	107,623
Accumulated Depreciation	$ 1,952
Residential developments | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	5 years
Residential developments | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	25 years
WaterColor Inn
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land & Improvements	1,137
Initial Cost to Company, Buildings & Improvements	13,689
Costs Capitalized Subsequent to Acquisition or Construction	6,413
Land & Land Improvements	1,794
Buildings and Improvements	19,445
Total	21,239
Accumulated Depreciation	$ 8,865
WaterColor Inn | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	10 years
WaterColor Inn | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	40 years
Clubs and golf courses
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land & Improvements	39,147
Initial Cost to Company, Buildings & Improvements	20,748
Costs Capitalized Subsequent to Acquisition or Construction	(1,083)
Land & Land Improvements	38,889
Buildings and Improvements	19,923
Total	58,812
Accumulated Depreciation	$ 26,026
Clubs and golf courses | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	10 years
Clubs and golf courses | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	25 years
Marinas
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land & Improvements	5,765
Initial Cost to Company, Buildings & Improvements	9,520
Costs Capitalized Subsequent to Acquisition or Construction	1,165
Land & Land Improvements	6,786
Buildings and Improvements	9,664
Total	16,450
Accumulated Depreciation	$ 4,669
Marinas | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	10 years
Marinas | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	25 years
Other
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land & Improvements	1,100
Initial Cost to Company, Buildings & Improvements	10,057
Costs Capitalized Subsequent to Acquisition or Construction	89
Land & Land Improvements	1,100
Buildings and Improvements	10,146
Total	11,246
Accumulated Depreciation	$ 3,933
Other | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	10 years
Other | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	30 years
Pier Park North
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 46,783
Initial Cost to Company, Land & Improvements	13,711
Initial Cost to Company, Buildings & Improvements	35,243
Costs Capitalized Subsequent to Acquisition or Construction	2,312
Land & Land Improvements	13,711
Buildings and Improvements	37,555
Total	51,266
Accumulated Depreciation	$ 5,930
Pier Park North | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	15 years
Pier Park North | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	39 years
Town centers
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land & Improvements	713
Initial Cost to Company, Buildings & Improvements	21,887
Costs Capitalized Subsequent to Acquisition or Construction	(2,141)
Land & Land Improvements	784
Buildings and Improvements	19,675
Total	20,459
Accumulated Depreciation	$ 14,873
Town centers | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	10 years
Town centers | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	25 years
VentureCrossings
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land & Improvements	5,791
Initial Cost to Company, Buildings & Improvements	24,490
Costs Capitalized Subsequent to Acquisition or Construction	(3,730)
Land & Land Improvements	2,611
Buildings and Improvements	23,940
Total	26,551
Accumulated Depreciation	$ 2,537
VentureCrossings | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	10 years
VentureCrossings | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	39 years
Other
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 1,606
Initial Cost to Company, Land & Improvements	3,304
Initial Cost to Company, Buildings & Improvements	8,579
Costs Capitalized Subsequent to Acquisition or Construction	721
Land & Land Improvements	4,025
Buildings and Improvements	8,579
Total	12,604
Accumulated Depreciation	$ 870
Other | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	10 years
Other | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	39 years
Commercial developments
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 5,313
Initial Cost to Company, Land & Improvements	35,068
Initial Cost to Company, Buildings & Improvements	0
Costs Capitalized Subsequent to Acquisition or Construction	18,439
Land & Land Improvements	53,507
Buildings and Improvements	0
Total	53,507
Accumulated Depreciation	$ 59
Depreciation Life (in years)	5 years
Timberlands
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land & Improvements	6,694
Initial Cost to Company, Buildings & Improvements	1,886
Costs Capitalized Subsequent to Acquisition or Construction	10,930
Land & Land Improvements	17,625
Buildings and Improvements	1,885
Total	19,510
Accumulated Depreciation	$ 2,010
Timberlands | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	5 years
Timberlands | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	30 years
Unimproved land
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 0
Initial Cost to Company, Land & Improvements	85
Initial Cost to Company, Buildings & Improvements	0
Costs Capitalized Subsequent to Acquisition or Construction	5,024
Land & Land Improvements	5,109
Buildings and Improvements	0
Total	5,109
Accumulated Depreciation	$ 28
Unimproved land | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	15 years
Unimproved land | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Depreciation Life (in years)	20 years