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Noncontrolling Interests Components of Redeemable Noncontrolling Interests (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Redeemable Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interests $ 19,468 $ 19,287 $ 21,691 $ 19,598
Stockholders' Equity Attributable to Noncontrolling Interest 19,639 19,287    
Nonredeemable Noncontrolling Interest 171 0    
Anchor [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Stockholders' Equity Attributable to Noncontrolling Interest 11,533 11,105    
BOS [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Stockholders' Equity Attributable to Noncontrolling Interest 5,337 5,782    
DGHM [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Stockholders' Equity Attributable to Noncontrolling Interest 2,769 2,400    
DTC [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interests   $ 19,468