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Fair Value Measurements (Assets Measured On Nonrecurring Basis) (Details) (USD $)
In Thousands
0 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 28, 2011
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Total   $ 33,168   $ 33,168   $ 13,025
Impairment loss   (2,600) 0 (3,800) (300)  
Impairment loss on investments (18,700)          
Total       (18,852) [1]   (15,142) [1]
Impaired Property [Member]
           
Property   6,445   6,445   2,325
Impairment loss       (115) [1]   (2,827) [1]
Impaired Property [Member] | Significant Other Observable Inputs (Level 2) [Member]
           
Property   6,445   6,445    
Impaired Property [Member] | Significant Unobservable Inputs (Level 3) [Member]
           
Property           2,325
Subordinate Tax Increment Revenue Bonds [Member]
           
Investments   26,723   26,723   10,700
Impairment loss on investments       (18,737) [1]   (11,717) [1]
Subordinate Tax Increment Revenue Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
           
Investments   26,723   26,723   10,700
Subordinate Tax Increment Revenue Note [Member]
           
Impairment loss on investments           (598) [1]
Significant Other Observable Inputs (Level 2) [Member]
           
Total   6,445   6,445    
Significant Unobservable Inputs (Level 3) [Member]
           
Total   $ 26,723   $ 26,723   $ 13,025
[1] Total gains (losses) exclude impairments on disposed assets.