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Credit Facilities and Long-Term Debt, Revolving Credit Facility (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 250 $ 200
Expiration date Mar. 01, 2018  
Unused fee (in hundredths) 0.25%  
Additional available borrowing capacity 144.6  
Financial covenants At any time that our average borrowing availability is less than $25 million, the terms of our restated credit agreement provide for, among other provisions, a financial covenant requiring us, on a consolidated basis, to maintain specified levels of fixed charge coverage at the end of each fiscal quarter (rolling twelve months).  
Direct Borrowings [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Margin on variable rate (in hundredths) 1.50%  
Direct Borrowings [Member] | Maximum [Member]
    
Line of Credit Facility [Line Items]    
Margin on variable rate (in hundredths) 2.00%  
Index Loan [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Margin on variable rate (in hundredths) 0.50%  
Index Loan [Member] | Maximum [Member]
    
Line of Credit Facility [Line Items]    
Margin on variable rate (in hundredths) 1.00%  
General Electric Capital Corporation Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Outstanding borrowings under credit facility 32.2 40.4
General Electric Capital Corporation Credit Facility [Member] | Direct Borrowings [Member]
    
Line of Credit Facility [Line Items]    
Outstanding borrowings under credit facility 30.0 25.0
General Electric Capital Corporation Credit Facility [Member] | Index Loan [Member]
    
Line of Credit Facility [Line Items]    
Outstanding borrowings under credit facility 2.2 15.4
GE Canada Finance Holding Company Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity 10  
Outstanding borrowings under credit facility $ 0