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Land owned

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Fair Value Measurements (Narrative) (Details) (USD $)	9 Months Ended		3 Months Ended	9 Months Ended
Fair Value Measurements (Narrative) (Details) (USD $)	Sep. 30, 2011 years A months	Dec. 31, 2010	Jun. 30, 2011 Disposed Properties [Member] A	Sep. 30, 2011 Qualifying Special Purpose [Member]	Sep. 30, 2010 Qualifying Special Purpose [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest income				$ 500,000	$ 500,000
Term on alliance agreement (years)	3
Break-even payments to Southwest in the second year of air service	12,000,000
Standby guarantee liability	800,000	800,000
Valuation adjustments and write-offs	2,500,000
Number of real estate properties			4
Carrying value of long-lived assets	4,600,000
Land owned (acres)	573,000		53
Fair value of long-lived assets	2,925,000
Impairment loss on long lived assets	2,479,000
Impaired predevelopment costs	$ 800,000