Annual report pursuant to Section 13 and 15(d)

Noncontrolling Interests In Subsidiaries (Changes Of Noncontrolling Interests In Subsidiaries) (Details)

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Noncontrolling Interests In Subsidiaries (Changes Of Noncontrolling Interests In Subsidiaries) (Details)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jan. 05, 2012
Jan. 05, 2011
Noncontrolling Interests In Subsidiaries [Abstract]          
Balance, Beginning 13,007,668 13,495,036 14,437,731 12,197,122 13,007,668
Redemption of common units for shares of common stock (810,546) (487,368) (942,695)    
Balance, Ending 12,197,122 13,007,668 13,495,036 12,197,122 13,007,668