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Business and Credit Concentrations (Tables)
 6 Months Ended
Jun. 30, 2011
Business and Credit Concentrations Tables Abstract  
Company's top five manufacturers produced
                                 
    Three Months Ended June 30,   Six Months Ended June 30,
    2011   2010   2011   2010
Manufacturer #1
    31.7 %     36.8 %     30.8 %     34.6 %
Manufacturer #2
    11.2 %     14.2 %     11.4 %     13.3 %
Manufacturer #3
    7.6 %     9.4 %     8.6 %     10.1 %
Manufacturer #4
    6.8 %     8.1 %     6.7 %     8.6 %
Manufacturer #5
    6.3 %     4.6 %     6.3 %     4.7 %
 
                               
 
                               
 
    63.6 %     73.1 %     63.8 %     71.3 %