Other Current Assets Fair Value Measurements Using (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Impairment of Long-Lived Assets to be Disposed of	$ 1,800,000
Land held for sale		4,087,000		851,000
Land held for sale Total Gains (Losses)		(2,442,000)		2,355,000	5,598,000
Other Assets
Land held for sale		1,300,000	[1]
Land held for sale Total Gains (Losses)		(1,800,000)	[1]
Quoted Prices In Active Markets for Identical Assets Level 1 | Other Assets
Land held for sale		0	[1]
Significant Other Observable Inputs Level 2 | Other Assets
Land held for sale		1,300,000	[1]
Significant Unobservable Inputs Level 3 | Other Assets
Land held for sale		0	[1]
Change During Period, Fair Value Disclosure
Inventory, Land Held-for-sale	$ 1,800,000

[1] Included in Other Assets