Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred Tax Assets, Tax Deferred Expense
Federal net operating carryforward	$ 32,201	$ 21,751
State net operating loss carryforward	21,442	18,837
Impairment losses	147,467	7,949
Deferred compensation	1,092	7,235
Accrued casualty and other reserves	103	5,521
Capitalized real estate taxes	7,781	7,175
Liability for retiree medical plan	39	4,917
Prepaid income on land sales	10,536	10,124
Other	4,087	3,578
Total gross deferred tax assets	224,748	87,087
Valuation allowance	(95,469)	(964)
Total net deferred tax assets	129,279	86,123
Deferred gain on land sales and involuntary conversions	32,726	34,287
Prepaid pension asset	17,291	15,782
Installment sale	58,861	57,899
Depreciation	4,639	6,830
Other	4,047	5,950
Total gross deferred tax liabilities	117,564	120,748
Net deferred tax asset (liability)	$ 11,715	$ (34,625)