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Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Intangible Assets [Line Items]        
Amortization of intangible assets $ 6,172 $ 5,379    
Intangible assets subject to amortization:        
Gross Carrying Amount 176,368   176,368  
Accumulated Amortization 80,161   73,988  
Net Carrying Amount 96,207   102,380  
Intangible assets not subject to amortization:        
Trademarks, Carrying Amount 186,075   186,075  
Goodwill, Carrying Amount 575,225   574,948 496,158
Total        
Gross Carrying Amount 937,668   937,391  
Net Carrying Amount 857,507   863,403  
Customer relations
        
Intangible assets subject to amortization:        
Gross Carrying Amount 110,007   110,007  
Accumulated Amortization 45,633   41,564  
Net Carrying Amount 64,374   68,443  
Customer relations | Minimum [Member]
        
Intangible Assets [Line Items]        
Estimated Useful Life 3 months      
Customer relations | Maximum [Member]
        
Intangible Assets [Line Items]        
Estimated Useful Life 10 years      
Contractor Relations [Member]
        
Intangible assets subject to amortization:        
Gross Carrying Amount 43,598   43,598  
Accumulated Amortization 31,907   30,737  
Net Carrying Amount 11,691   12,861  
Contractor Relations [Member] | Minimum [Member]
        
Intangible Assets [Line Items]        
Estimated Useful Life 2 years      
Contractor Relations [Member] | Maximum [Member]
        
Intangible Assets [Line Items]        
Estimated Useful Life 7 years      
Non-compete agreements
        
Intangible assets subject to amortization:        
Gross Carrying Amount 3,863   3,863  
Accumulated Amortization 1,570   1,424  
Net Carrying Amount 2,293   2,439  
Non-compete agreements | Minimum [Member]
        
Intangible Assets [Line Items]        
Estimated Useful Life 2 years      
Non-compete agreements | Maximum [Member]
        
Intangible Assets [Line Items]        
Estimated Useful Life 7 years      
Computer Software, Intangible Asset [Member]
        
Intangible Assets [Line Items]        
Estimated Useful Life 6 years      
Intangible assets subject to amortization:        
Gross Carrying Amount 18,900   18,900  
Accumulated Amortization 1,051   263  
Net Carrying Amount $ 17,849   $ 18,637