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Business Combinations (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Total Estimated Earn Out Payables     $ 41,913,000  
Aggregate purchase price of acquisitions 114,108,000 43,749,000 114,108,000 43,749,000
Cash payments for acquisitions 90,417,000 33,262,000 90,417,000 33,262,000
Notes payable 550,000 175,000 550,000 175,000
Assumption of liabilities 9,326,000 1,211,000 9,326,000 1,211,000
Total goodwill 69,673,000 27,856,000 69,673,000 27,856,000
Goodwill related to the earn-out payable 13,815,000   13,815,000  
Recorded earn-out payable     13,815,000 9,101,000
Goodwill currently deductible for income tax purposes 38,019,000 18,806,000 38,019,000 18,806,000
Goodwill expected tax non-deductible amount 17,839,000   17,839,000  
Total revenues related to acquisitions 8,493,000 4,561,000 12,949,000 6,348,000
Income before income taxes related to acquisitions 583,000 539,000 1,555,000 911,000
Additional consideration paid in cash 362,000 710,000 362,000 710,000
Issuance of notes payable 657,000 1,035,000 657,000 1,035,000
Maximum future contingency payments related to acquisitions 124,335,000   124,335,000  
Change in estimated acquistion earn-out payables 1,104,000 (719,000) 589,000 (1,556,000)
Interest expenses accreted 461,000 186,000 877,000 327,000
Estimated earn-out payables recorded as current liabilities 8,410,000   8,410,000  
Estimated earn-out payables recorded as noncurrent liabilities 33,503,000   33,503,000  
Non-Compete Agreements [Member]
        
Weighted average life (years)     5.0 5.0
Retail [Member]
        
Goodwill assigned 67,386,000 22,458,000 67,386,000 22,458,000
National Programs Divisions [Member]
        
Goodwill assigned 2,287,000   2,287,000  
Services [Member]
        
Goodwill assigned   5,398,000   5,398,000
Prior [Member]
        
Additional net consideration paid allocated to goodwill     1,019,000 1,745,000
Maximum future contingency payments related to acquisitions 30,360,000   30,360,000  
Subsequent [Member]
        
Maximum future contingency payments related to acquisitions $ 93,975,000   $ 93,975,000  
Purchased Customer Accounts [Member]
        
Weighted average life (years)     15.0 15.0
Stock Acquisitions [Member]
        
Number of Acquisitions     22 10
Asset Acquisitions [Member]
        
Number of Acquisitions     1