Line of Credit, Short-Term and Long-Term Borrowings (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Long-term debt
Long-term debt	$ 88,948,000	$ 63,634,000
Less current installments	9,974,000	11,984,000
Total long-term debt	78,974,000	51,650,000
Additional Line of Credit Short-Term and Long-Term Borrowings (Textual) [Abstract]
Outstanding letters of credit	2,800,000
Short-term borrowings	49,368,000	18,346,000
Note payable to bank one [Member]
Long-term debt
Long-term debt	35,542,000	39,325,000
Line of Credit Short-Term and Long-Term Borrowings (Textual) [Abstract]
Monthly Repayment Installment Of Note Payable	531,400
Fixed interest rate of note payable	3.54%
Balloon payment required under note payable	12,635,000
Note payable to bank two [Member]
Long-term debt
Long-term debt	35,179,000	0
Line of Credit Short-Term and Long-Term Borrowings (Textual) [Abstract]
Monthly Repayment Installment Of Note Payable	483,900
Fixed interest rate of note payable	3.19%
Balloon payment required under note payable	11,670,000
Note payable to bank three [Member]
Long-term debt
Long-term debt	0	6,900,000
Line of Credit Short-Term and Long-Term Borrowings (Textual) [Abstract]
Monthly Repayment Installment Of Note Payable	57,600
Fixed interest rate of note payable	7.89%
Balloon payment required under note payable	6,889,000
Loan From HF Logistics [Member]
Long-term debt
Long-term debt	18,193,000	17,358,000
Capital lease obligations [Member]
Long-term debt
Long-term debt	$ 34,000	$ 51,000