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Credit Facilities and Long-Term Debt (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Debt Instrument [Line Items]      
Other $ 200,000    
Total debt 97,246,000   73,299,000
Current maturities of debt 97,114,000   73,109,000
Long-term debt 132,000   190,000
Total debt 97,246,000   73,299,000
Deferred Financing Costs [Abstract]      
Deferred financing costs 3,200,000   3,800,000
Amortization of financing costs in 2012 600,000    
Amortization of financing costs in 2013 1,200,000    
Amortization of financing costs in 2014 1,200,000    
Amortization of financing costs in 2015 200,000    
Line of Credit Facility [Line Items]      
Capital lease obligations 200,000    
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 facililities 97,000,000   73,000,000
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 200,000,000    
Expiration date Mar. 01, 2015    
Additional available borrowing capacity 97,400,000    
Outstanding borrowings under credit facility 97,000,000   73,000,000
Weighted average interest rate (in hundredths) 1.99%   2.00%
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.    
Conditions for required financial covenants, minimum average borrowing availability over previous 30 days 30,000,000    
Conditions for required financial covenants, maximum borrowing availability 20,000,000    
Conditions for required financial covenants, minimum average borrowing availability over continuous 90 Days 30,000,000    
General Electric Capital Corporation Credit Facility [Member] | Direct Borrowings [Member]
      
Debt Instrument [Line Items]      
Revolving credit facililities 97,000,000   73,000,000
Line of Credit Facility [Line Items]      
Outstanding borrowings under credit facility 97,000,000   73,000,000
General Electric Capital Corporation Credit Facility [Member] | Index Loan [Member]
      
Debt Instrument [Line Items]      
Revolving credit facililities 0   0
Line of Credit Facility [Line Items]      
Outstanding borrowings under credit facility 0   0
Average daily loan balance outstanding 6,000,000 5,700,000 5,700,000
GE Canada Finance Holding Company Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 10,000,000    
Expiration date Mar. 01, 2015    
Line of Credit [Member]
      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 10,000,000    
Revolving credit facilities [Member]
      
Debt Instrument [Line Items]      
Revolving credit facililities 97,000,000   73,000,000
Line of Credit Facility [Line Items]      
Outstanding borrowings under credit facility 97,000,000   73,000,000
Other [Member]
      
Debt Instrument [Line Items]      
Other 246,000   299,000
Line of Credit Facility [Line Items]      
Capital lease obligations $ 246,000   $ 299,000