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Noncontrolling Interests Components of Noncontrolling Interests (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Redeemable Noncontrolling Interest [Line Items]        
Redeemable Noncontrolling Interests $ 19,675 $ 21,691 $ 21,885 $ 19,598
Anchor [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Redeemable Noncontrolling Interests 11,230 12,089    
BOS [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Redeemable Noncontrolling Interests 6,192 5,873    
DTC [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Redeemable Noncontrolling Interests 0 [1] 1,924 [1]    
DGHM [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Redeemable Noncontrolling Interests $ 2,253 $ 1,805    
[1] In the second quarter of 2012, the Company completed the sale of its affiliate DTC.