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Discontinued Operations (Tables)
12 Months Ended
Dec. 31, 2011
Discontinued Operations [Abstract]  
Schedule Of Discontinued Operations
    For the Years Ended
December 31,
 
    2011     2010     2009  

Revenues

  $ 3,534      $ 8,488      $ 16,197   

Gain on sale

    5,431        10,566        278   

Income from discontinued operations

    7,283        12,764        6,422   

Income from discontinued operations — diluted per share/unit

  $ 0.07      $ 0.13      $ 0.08