Segment Information - Information by Business Segment (Details) (USD $)	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, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Operating revenues	$ 33,868,000	$ 36,827,000	$ 33,788,000	$ 26,773,000	$ 22,614,000	$ 55,907,000	$ 30,357,000	$ 30,518,000		$ 131,256,000	$ 139,396,000	$ 145,285,000
Depreciation, depletion and amortization										9,131,000	10,110,000	15,840,000
Investment income, net										1,498,000	1,219,000	1,130,000
Interest Expense										(2,040,000)	(2,820,000)	(3,921,000)
Equity income (loss) in from unconsolidated affiliates										112,000	(46,000)	(93,000)
Income (loss) before equity in loss from unconsolidated affiliates and income taxes:										4,445,000	6,423,000	(385,873,000)
Payments to Acquire Productive Assets										42,060,000	23,395,000	30,722,000
Assets	669,472,000				645,521,000					669,472,000	645,521,000
Impairment losses									374,800,000	5,080,000	2,551,000	377,325,000
Pension charges										0	2,063,000	5,871,000
Equity Method Investments	2,200,000				2,200,000					2,200,000	2,200,000
Residential Real Estate
Segment Reporting Information [Line Items]
Operating revenues										33,698,000	22,115,000	12,595,000
Depreciation, depletion and amortization										776,000	1,802,000	2,457,000
Interest Expense										(1,999,000)	(2,802,000)	(3,555,000)
Income (loss) before equity in loss from unconsolidated affiliates and income taxes:										4,558,000	(6,772,000)	(355,080,000)
Payments to Acquire Productive Assets										12,284,000	7,679,000	12,023,000
Assets	141,097,000				141,526,000					141,097,000	141,526,000
Impairment losses										200,000		337,600,000
Commercial Real Estate
Segment Reporting Information [Line Items]
Operating revenues										10,881,000	10,400,000	3,778,000
Interest Expense										(41,000)	(18,000)	(366,000)
Income (loss) before equity in loss from unconsolidated affiliates and income taxes:										3,298,000	(271,000)	(42,516,000)
Payments to Acquire Productive Assets										2,388,000	3,829,000	11,833,000
Assets	62,924,000				64,961,000					62,924,000	64,961,000
Impairment losses												38,200,000
Rural land
Segment Reporting Information [Line Items]
Operating revenues										85,000	23,413,000	3,472,000
Income (loss) before equity in loss from unconsolidated affiliates and income taxes:										22,000	16,791,000	2,158,000
Assets	6,147,000				6,219,000					6,147,000	6,219,000
Resorts, leisure and leasing operations
Segment Reporting Information [Line Items]
Operating revenues										50,767,000	44,407,000	38,239,000
Depreciation, depletion and amortization										6,424,000	5,714,000	6,924,000
Equity income (loss) in from unconsolidated affiliates										112,000	(46,000)	(93,000)
Income (loss) before equity in loss from unconsolidated affiliates and income taxes:										(1,928,000)	(1,414,000)	(8,020,000)
Payments to Acquire Productive Assets										23,486,000	9,023,000	4,007,000
Assets	142,940,000				125,596,000					142,940,000	125,596,000
Impairment losses										4,900,000	2,600,000	1,400,000
Forestry
Segment Reporting Information [Line Items]
Operating revenues										35,450,000	38,977,000	86,703,000
Depreciation, depletion and amortization										1,775,000	2,105,000	4,950,000
Income (loss) before equity in loss from unconsolidated affiliates and income taxes:										13,384,000	13,475,000	59,092,000
Payments to Acquire Productive Assets										3,678,000	2,701,000	2,766,000
Assets	54,742,000				53,839,000					54,742,000	53,839,000
Other
Segment Reporting Information [Line Items]
Operating revenues										375,000	84,000	498,000
Depreciation, depletion and amortization										156,000	489,000	1,509,000
Investment income, net										113,000	68,000	102,000
Income (loss) before equity in loss from unconsolidated affiliates and income taxes:										(14,889,000)	(15,386,000)	(41,507,000)
Payments to Acquire Productive Assets										224,000	163,000	93,000
Assets	261,622,000				253,380,000					261,622,000	253,380,000
Pension charges											2,100,000	5,900,000
Corporate
Segment Reporting Information [Line Items]
Investment income, net										$ 1,385,000	$ 1,151,000	$ 1,028,000