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, 2012
Dec. 31, 2011
Dec. 31, 2010
Jan. 04, 2013
Jan. 05, 2012
Noncontrolling Interests In Subsidiaries [Abstract]          
Balance, Beginning 12,197,122 13,007,668 13,495,036 12,141,836 12,197,122
Redemption of common units for shares of common stock (55,286) (810,546) (487,368)    
Balance, Ending 12,141,836 12,197,122 13,007,668 12,141,836 12,197,122