Business Segments - Revenue Components of Real Estate Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue from External Customer [Line Items]
Segment revenues	$ 8,008	$ 7,475	$ 15,153	$ 17,235
Equity in earnings of unconsolidated joint ventures, net	1,148	1,270	1,586	1,679
Mineral resources
Revenue from External Customer [Line Items]
Segment revenues	2,441	2,765	4,705	5,631
Mineral resources | Oil and Gas
Revenue from External Customer [Line Items]
Segment revenues			3,522	4,418
Mineral resources | Rock Aggregate
Revenue from External Customer [Line Items]
Segment revenues			592	296
Mineral resources | Cement
Revenue from External Customer [Line Items]
Segment revenues			479	375
Mineral resources | Land Lease for Oil Exploration
Revenue from External Customer [Line Items]
Segment revenues			112	542
Real estate - commercial/industrial
Revenue from External Customer [Line Items]
Segment revenues	2,553	2,825	5,495	5,547
Equity in earnings of unconsolidated joint ventures, net			1,621	1,720
Revenues and Income (Loss) from Equity Method Investments			7,116	7,267
Real estate - commercial/industrial | Commercial leases
Revenue from External Customer [Line Items]
Segment revenues			2,785	3,401
Real estate - commercial/industrial | Grazing leases
Revenue from External Customer [Line Items]
Segment revenues			713	748
Real estate - commercial/industrial | All other land management ancillary services
Revenue from External Customer [Line Items]
Segment revenues			1,997	1,398
Real estate - resort/residential
Revenue from External Customer [Line Items]
Segment revenues		471	587
Equity in earnings of unconsolidated joint ventures, net		(41)	(35)
Revenues and Income (Loss) from Equity Method Investments		430	552
Real estate - resort/residential | Hay sales - Centennial operations
Revenue from External Customer [Line Items]
Segment revenues		307	404
Real estate - resort/residential | Management fees
Revenue from External Customer [Line Items]
Segment revenues		156	180
Real estate - resort/residential | Other
Revenue from External Customer [Line Items]
Segment revenues		$ 8	$ 3