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Commitments And Contingencies (Narrative) (Details) (USD $)
 0 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended
Apr. 28, 2011
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Jun. 30, 2011
Minimum [Member]
Capital Additions [Member]
Jun. 30, 2011
Maximum [Member]
Capital Additions [Member]
Jun. 30, 2011
Capital Additions [Member]
Jun. 30, 2011
Performance Guarantee [Member]
Dec. 31, 2009
Performance Guarantee [Member]
Apr. 28, 2011
Performance Guarantee [Member]
Apr. 28, 2011
Subordinate Tax Increment Revenue Bonds [Member]
Jun. 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]
Value of shares issued in exchange for interests in real estate joint ventures and partnerships   $ 0 $ 700,000                      
Aggregate redemption value of interests   41,000,000   39,000,000                    
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            
Lawsuit settlement date   January 2011             2009          
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 bonds 16,500,000                          
Subordinated tax increment revenue bonds at cost                     22,400,000      
Bond fair value                     10,700,000 0   51,300,000
Impairment losses related to incremental tax revenue bonds 18,700,000                     18,737,000 [1] 11,717,000 [1]  
Construction contract commitment             $ 57,200,000              
Long-term purchase commitment, description  

We have entered into commitments aggregating $57.2 million comprised principally of construction contracts which are generally due in 12 to 36 months.

                       
Construction contract period, months         12 36                
[1] Total gains (losses) exclude impairments on disposed assets.