Business Segments - Reconciliation of Reveunes, Segment Profits (Losses) and Net Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenues
Segment revenues																	$ 45,338		$ 47,089		$ 63,098
Investment income																	941		1,242		1,260
Other income																	66		113		98
Interest income (expense)																	0		(12)		0
Total revenues	13,216	[1]	15,364	[1]	7,727	[1]	10,038	[1]	13,904	[1]	16,442	[1]	8,177	[1]	9,921	[1]	46,345	[1]	48,444	[1]
Segment profits (losses) and net income (loss)
Segment profits																	1,176		3,128		20,874
Costs and expenses																	(44,162)		(43,961)		(42,224)
Equity in earnings (losses)																	4,006		2,535		916
Income before income tax expense																	6,189		7,006		23,148
Reportable Segment
Revenues
Segment revenues																	49,344		49,624		64,014
Total revenues																	50,351		50,979		65,372
Segment profits (losses) and net income (loss)
Segment profits																	17,823	[2]	18,935	[2]	34,067	[2]
Real estate - commercial/industrial
Segment Reporting Information [Line Items]
Revenues and Income (Loss) from Equity Method Investments																	15,213		12,518		14,665
Revenues
Segment revenues																	11,148		9,941		13,746
Segment profits (losses) and net income (loss)
Segment profits																	2,311		247		1,444
Costs and expenses																	(12,902)		(12,271)		(13,221)
Equity in earnings (losses)																	4,065		2,577		919
Real estate- resort/residential
Segment Reporting Information [Line Items]
Revenues and Income (Loss) from Equity Method Investments																	1,207		541		16,131
Revenues
Segment revenues																	1,266		583		16,134
Segment profits (losses) and net income (loss)
Segment profits																	(2,144)		(4,220)		12,189
Costs and expenses																	(3,351)		(4,761)		(3,942)
Mineral resources
Revenues
Segment revenues																	10,242	[3]	14,012	[3]	12,206	[3]
Segment profits (losses) and net income (loss)
Segment profits																	9,780	[3]	13,678	[3]	11,997	[3]
Costs and expenses																	(462)		(334)		(209)
Farming
Revenues
Segment revenues																	22,682		22,553		21,012
Segment profits (losses) and net income (loss)
Segment profits																	7,876		9,230		8,437
Costs and expenses																	(14,806)		(13,323)		(12,575)
Corporate expenses
Segment profits (losses) and net income (loss)
Costs and expenses																	$ (12,641)		$ (13,272)		$ (12,277)

[1] Includes investment income and other income.

[2] Segment profits are revenues from operations less operating expenses, excluding investment income and expense, corporate expenses, equity in earnings of unconsolidated joint ventures, and income taxes.

[3] During the fourth quarter of 2012, the Company evaluated its operations and determined that an additional segment should be reported, Mineral Resources. Mineral Resources collects royalty income from oil and gas leases, rock and aggregate leases, and from a cement company.