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Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Intangible Assets [Line Items]            
Amortization of intangible assets $ 6,018 $ 5,199 $ 18,346 $ 15,853    
Intangible assets subject to amortization:            
Gross Carrying Amount 176,145   176,145   176,368  
Accumulated Amortization 92,170   92,170   73,988  
Net Carrying Amount 83,975   83,975   102,380  
Intangible assets not subject to amortization:            
Trademarks, Carrying Amount 185,846   185,846   186,075  
Goodwill, Carrying Amount 574,023   574,023   574,948 496,158
Intangible Assets, Gross (Including Goodwill) 936,014   936,014   937,391  
Total            
Net Carrying Amount 843,844   843,844   863,403  
Customer relations
            
Intangible assets subject to amortization:            
Gross Carrying Amount 109,872   109,872   110,007  
Accumulated Amortization 53,764   53,764   41,564  
Net Carrying Amount 56,108   56,108   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 43,545   43,545   43,598  
Accumulated Amortization 33,971   33,971   30,737  
Net Carrying Amount 9,574   9,574   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 3,828   3,828   3,863  
Accumulated Amortization 1,855   1,855   1,424  
Net Carrying Amount 1,973   1,973   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   18,900  
Accumulated Amortization 2,580   2,580   263  
Net Carrying Amount $ 16,320   $ 16,320   $ 18,637