Investment In Real Estate (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Real Estate Properties [Line Items]
Operating property	$ 200,398	$ 199,890
Development property	224,383	224,418
Investment property	5,124	5,124
Residential real estate	2,248	2,259
Total real estate investments	432,153	431,691
Less: Accumulated depreciation	45,658	44,489
Investment in real estate	386,495	387,202
Residential Real Estate [Member]
Real Estate Properties [Line Items]
Operating property	136,641	136,563
Development property	158,671	157,245
Commercial Real Estate [Member]
Real Estate Properties [Line Items]
Operating property	5,367	4,691
Development property	57,683	57,600
Investment property	700	700
Rural Land Sales [Member]
Real Estate Properties [Line Items]
Operating property	139	139
Development property	8,029	9,573
Forestry [Member]
Real Estate Properties [Line Items]
Operating property	57,841	58,087
Investment property	953	953
Other [Member]
Real Estate Properties [Line Items]
Operating property	410	410
Development property
Investment property	$ 3,471	$ 3,471