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Noncontrolling Interests Components of Noncontrolling Interests (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Redeemable Noncontrolling Interest [Line Items]        
Redeemable and Nonredeemable Noncontrolling Interest $ 20,884 $ 19,639    
Redeemable Noncontrolling Interests 20,774 19,468 17,438 19,287
Nonredeemable Noncontrolling Interest 110 171    
Anchor [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Redeemable and Nonredeemable Noncontrolling Interest 12,069 11,533    
BOS [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Redeemable and Nonredeemable Noncontrolling Interest 5,931 5,337    
DGHM [Member]
       
Redeemable Noncontrolling Interest [Line Items]        
Redeemable and Nonredeemable Noncontrolling Interest $ 2,884 $ 2,769