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Noncontrolling Interests Components of Noncontrolling Interests (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Redeemable Noncontrolling Interest [Line Items]        
Redeemable and Nonredeemable Noncontrolling Interest $ 21,660 $ 19,639    
Redeemable Noncontrolling Interests 21,397 19,468 17,224 19,287
Nonredeemable Noncontrolling Interest 263 171    
Anchor [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Redeemable and Nonredeemable Noncontrolling Interest 12,338 11,533    
BOS [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Redeemable and Nonredeemable Noncontrolling Interest 6,033 5,337    
DGHM [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Redeemable and Nonredeemable Noncontrolling Interest $ 3,289 $ 2,769