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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accrued Liabilities, Current [Abstract]    
Payroll and related taxes $ 19,614 $ 16,808
Bonuses and commissions 14,159 16,233
Profit sharing contribution 11,110 7,717
Insurance 25,188 30,548
Promotions 13,581 10,866
Sales, real estate, and personal property taxes 38,562 26,676
Vehicle loss reserve and deferred rebates 200 743
Legal reserves 531 100
Other 3,210 2,271
Accrued expenses $ 126,155 $ 111,962