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, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues
Segment revenues																	$ 51,252		$ 45,338		$ 47,089
Investment income																	696		941		1,242
Other income																	343		66		113
Interest expense																	0		0		(12)
Total revenues and other income	14,949	[1]	14,056	[1]	8,526	[1]	14,760	[1]	13,216	[1]	15,364	[1]	7,727	[1]	10,038	[1]	52,291	[1]	46,345	[1]
Segment profits (losses) and net income (loss)
Segment profits																	2,126		1,176		3,128
Costs and expenses																	(49,126)		(44,162)		(43,961)
Equity in earnings (losses)																	5,294		4,006		2,535
Income before income tax expense																	8,459		6,189		7,006
Reportable Segment
Revenues
Segment revenues																	56,546		49,344		49,624
Total revenues and other income																	57,585		50,351		50,979
Segment profits (losses) and net income (loss)
Segment profits																	18,066	[2]	17,008	[2]	18,227	[2]
Real estate - commercial/industrial
Revenues
Revenues and Income (Loss) from Equity Method Investments																	16,708		15,213		12,518
Segment revenues																	11,379		11,148		9,941
Segment profits (losses) and net income (loss)
Segment profits																	3,504		2,311		247
Costs and expenses																	(13,204)		(12,902)		(12,271)
Equity in earnings (losses)																	5,329		4,065		2,577
Real estate- resort/residential
Revenues
Revenues and Income (Loss) from Equity Method Investments																	148		279		(42)
Segment revenues																	183		338		0
Segment profits (losses) and net income (loss)
Segment profits																	(2,460)		(1,952)		(3,739)
Costs and expenses																	(2,608)		(2,231)		(3,697)
Mineral resources
Revenues
Segment revenues																	16,255	[3]	10,242	[3]	14,012	[3]
Segment profits (losses) and net income (loss)
Segment profits																	9,837	[3]	8,965	[3]	12,970	[3]
Costs and expenses																	(6,418)		(1,277)		(1,042)
Farming
Revenues
Segment revenues																	23,435		23,610		23,136
Segment profits (losses) and net income (loss)
Segment profits																	7,185		7,684		8,749
Costs and expenses																	(16,250)		(15,926)		(14,387)
Corporate expenses
Segment profits (losses) and net income (loss)
Costs and expenses																	$ (10,646)		$ (11,826)		$ (12,564)

[1] Includes investment income and other income.

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