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Commitments And Contingencies (Narrative) (Details) (USD $)
0 Months Ended9 Months Ended9 Months Ended12 Months Ended0 Months Ended9 Months Ended12 Months Ended0 Months Ended
Apr. 28, 2011
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2011
Noncontrolling Interests [Member]
Sep. 30, 2010
Noncontrolling Interests [Member]
Sep. 30, 2011
Minimum [Member]
Capital Additions [Member]
Sep. 30, 2011
Maximum [Member]
Capital Additions [Member]
Sep. 30, 2011
Capital Additions [Member]
Dec. 31, 2010
Performance Guarantee [Member]
Dec. 31, 2009
Performance Guarantee [Member]
Apr. 28, 2011
Performance Guarantee [Member]
Apr. 28, 2011
Subordinate Tax Increment Revenue Bonds [Member]
Sep. 30, 2011
Subordinate Tax Increment Revenue Bonds [Member]
Dec. 31, 2010
Subordinate Tax Increment Revenue Bonds [Member]
Apr. 28, 2011
Senior Tax Increment Revenue Bonds [Member]
Commitments And Contingencies [Line Items]               
Shares issued in exchange for noncontrolling interests   $ 0$ 746,000          
Aggregate redemption value of interests 34,000,00039,000,000            
Contingency potential cash payment 29,000,000             
Contingency cash paid 18,900,000             
Contingent consideration expiration date July 2010             
Settlement agreement date January 2011       2009     
Contingent consideration acquisition date January 2007             
Face value of guaranteed bonds        97,000,000      
Bond liability settlement date        2030      
Settlement letter of credit        46,300,000      
Terminated letter of credit          46,300,000    
Loss contingency, settlement agreement, terms        

In connection with the above project and a lawsuit settlement in 2009, the joint venture purchased a portion of the bonds in the amount of $51.3 million at par, and we established a $46.3 million letter of credit.

      
Settlement bond payment        51,300,000      
Agency issued senior bonds              74,100,000
Agency issued subordinate bonds           57,700,000   
Subordinated bonds received on exchange of bonds           57,700,000   
Cash received on exchange of bonds16,500,000              
Subordinated tax increment revenue bonds at cost           22,400,000   
Bond fair value           10,700,0000 51,300,000
Impairment losses related to incremental tax revenue bonds            18,737,000[1]11,717,000[1] 
Construction contract commitment       $ 48,300,000       
Long-term purchase commitment, description 

We have entered into commitments aggregating $48.3 million comprised principally of construction contracts which are generally due in 12 to 36 months.

             
Construction contract period, months     1236        
[1] Total gains (losses) exclude impairments on disposed assets.