| 
           Noncontrolling Interests In Subsidiaries (Changes Of Noncontrolling Interests In Subsidiaries) (Details) 
         | 
        6 Months Ended | 
|---|---|
| 
           Jun. 30, 2011 
         | 
      |
| Noncontrolling Interests In Subsidiaries | |
| Balance at January 1, 2011 | 13,007,668 | 
| Redemption of common units for shares of common stock | (201,542) | 
| Balance at June 30, 2011 | 12,806,126 | 
| X | ||||||||||
| 
             
- Definition 
          The number of common units outstanding. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Common Units Redeemed For Common Shares 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Noncontrolling Interests in Subsidiaries [Abstract] 
  |