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Credit Facilities and Long-Term Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Revolving credit facilities $ 40,453,000 $ 73,000,000
Other 195,000 299,000
Total debt 40,648,000 73,299,000
Current maturities of long-term debt 40,573,000 73,109,000
Long-term debt 75,000 190,000
Maturities of long term debt in 2013 100,000  
Maturities of long term debt in 2014-2015 100,000  
Amortization of financing cost for future years [Abstract]    
Amortization of financing costs in 2013 1,162,000  
Amortization of financing costs in 2014 1,162,000  
Amortization of financing costs in 2015 291,000  
Amortization of financing costs in 2016 0  
2017 and beyond 0  
Total amortization 2,615,000 3,800,000
Line of Credit Facility [Line Items]    
Maximum borrowing capacity 200,000,000  
Expiration date Mar. 01, 2015  
Additional available borrowing capacity 111,900,000  
Outstanding borrowings under credit facility 40,453,000 73,000,000
Financial covenants At any time that our average borrowing availability over the previous thirty days is less than $30 million or if our borrowing availability is $20 million or less, and until such time that we have maintained an average borrowing availability of $30 million or greater for a continuous period of ninety days, the terms of our restated credit agreement provide for, among other provisions, financial covenants requiring us, on a consolidated basis, (1) to maintain specified levels of fixed charge coverage at the end of each fiscal quarter (rolling twelve months), and (2) to limit capital expenditure levels.  
Capital lease obligations 195,000 299,000
Direct Borrowings [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Margin on variable rate (in hundredths) 1.75%  
Direct Borrowings [Member] | Maximum [Member]
    
Line of Credit Facility [Line Items]    
Margin on variable rate (in hundredths) 2.25%  
Index Loan [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Margin on variable rate (in hundredths) 0.75%  
Index Loan [Member] | Maximum [Member]
    
Line of Credit Facility [Line Items]    
Margin on variable rate (in hundredths) 1.25%  
General Electric Capital Corporation Credit Facility [Member]
    
Debt Instrument [Line Items]    
Revolving credit facilities 40,400,000 73,000,000
Line of Credit Facility [Line Items]    
Outstanding borrowings under credit facility 40,400,000 73,000,000
Weighted average interest rate (in hundredths) 2.70% 2.00%
General Electric Capital Corporation Credit Facility [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Conditions for required financial covenants, minimum average borrowing availability over previous 30 days 30,000,000  
Conditions for required financial covenants, minimum average borrowing availability over continuous 90 Days 30,000,000  
General Electric Capital Corporation Credit Facility [Member] | Maximum [Member]
    
Line of Credit Facility [Line Items]    
Conditions for required financial covenants, maximum borrowing availability 20,000,000  
General Electric Capital Corporation Credit Facility [Member] | Direct Borrowings [Member]
    
Debt Instrument [Line Items]    
Revolving credit facilities 25,000,000 73,000,000
Line of Credit Facility [Line Items]    
Outstanding borrowings under credit facility 25,000,000 73,000,000
Weighted average interest rate (in hundredths) 2.00%  
General Electric Capital Corporation Credit Facility [Member] | Index Loan [Member]
    
Debt Instrument [Line Items]    
Revolving credit facilities 15,400,000 0
Line of Credit Facility [Line Items]    
Outstanding borrowings under credit facility 15,400,000 0
Weighted average interest rate (in hundredths) 4.00%  
Average daily loan balance outstanding 6,100,000 5,700,000
GE Canada Finance Holding Company Credit Facility [Member]
    
Debt Instrument [Line Items]    
Revolving credit facilities 0  
Line of Credit Facility [Line Items]    
Maximum borrowing capacity 10,000,000  
Outstanding borrowings under credit facility 0  
Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 10,000,000