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Summary of Significant Accounting Policies (Phantom) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]      
Gain (Loss) on Sale of Property Plant Equipment $ 8,309 $ 43,520 $ 5,740
Buildings | Minimum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Buildings | Maximum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 50 years    
Furniture and fixtures | Minimum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 1 year    
Furniture and fixtures | Maximum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 15 years    
Capitalized internal use software | Minimum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 1 year    
Capitalized internal use software | Maximum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 15 years    
Service cars and service equipment | Minimum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 1 year    
Service cars and service equipment | Maximum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 13 years    
Other intangible assets | Minimum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Other intangible assets | Maximum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 20 years    
Cars | Minimum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 4 months    
Cars | Maximum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 27 months    
Other equipment | Minimum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 24 months    
Other equipment | Maximum
     
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 108 months    
Direct operating
     
Property, Plant and Equipment [Line Items]      
Gain (Loss) on Sale of Property Plant Equipment $ 6,300 $ 43,100