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Amortizable Intangible Assets (Schedule of Amortizable Intangible Assets) (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Gross Carrying Value $ 866,981,000 $ 836,324,000
Accumulated Amortization (378,614,000) (354,424,000)
Net Carrying Value 488,367,000 481,900,000
Amortization expense estimated, year one 54,274,000  
Amortization expense estimated, year two 53,988,000  
Amortization expense estimated, year three 53,087,000  
Amortization expense estimated, year four 51,931,000  
Amortization expense estimated, year five 50,598,000  
Purchased Customer Accounts [Member]
    
Gross Carrying Value 841,873,000 811,143,000
Accumulated Amortization (354,864,000) (330,627,000)
Net Carrying Value 487,009,000 480,516,000
Weighted average life (years) 14.9 14.9
Non-Compete Agreements [Member]
    
Gross Carrying Value 25,108,000 25,181,000
Accumulated Amortization (23,750,000) (23,797,000)
Net Carrying Value $ 1,358,000 $ 1,384,000
Weighted average life (years) 7.2 7.3