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Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Intangible Assets [Line Items]        
Amortization of intangible assets $ 5,379 $ 634    
Intangible assets subject to amortization:        
Gross Carrying Amount 144,043   144,142  
Accumulated Amortization 57,468   52,154  
Net Carrying Amount 86,575   91,988  
Intangible assets not subject to amortization:        
Trademarks, Carrying Amount 171,749   171,852  
Goodwill, Carrying Amount 497,580   498,356 229,234
Total        
Gross Carrying Amount 813,372   814,350  
Net Carrying Amount 755,904   762,196  
Customer relations
        
Intangible assets subject to amortization:        
Gross Carrying Amount 103,223   103,285  
Accumulated Amortization 27,819   23,338  
Net Carrying Amount 75,404   79,947  
Customer relations | Minimum
        
Intangible Assets [Line Items]        
Estimated Useful Life 3 months      
Customer relations | Maximum
        
Intangible Assets [Line Items]        
Estimated Useful Life 10 years      
Contractor relations
        
Intangible assets subject to amortization:        
Gross Carrying Amount 37,848   37,871  
Accumulated Amortization 28,466   27,754  
Net Carrying Amount 9,382   10,117  
Contractor relations | Minimum
        
Intangible Assets [Line Items]        
Estimated Useful Life 2 years      
Contractor relations | Maximum
        
Intangible Assets [Line Items]        
Estimated Useful Life 7 years      
Non-compete agreements
        
Intangible assets subject to amortization:        
Gross Carrying Amount 2,972   2,986  
Accumulated Amortization 1,183   1,062  
Net Carrying Amount $ 1,789   $ 1,924  
Non-compete agreements | Minimum
        
Intangible Assets [Line Items]        
Estimated Useful Life 2 years      
Non-compete agreements | Maximum
        
Intangible Assets [Line Items]        
Estimated Useful Life 7 years