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Credit Facilities and Long-Term Debt (Details) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Direct Borrowings [Member]
Minimum [Member]
Jun. 30, 2013
Direct Borrowings [Member]
Maximum [Member]
Jun. 30, 2013
Index Loan [Member]
Minimum [Member]
Jun. 30, 2013
Index Loan [Member]
Maximum [Member]
Jun. 30, 2013
General Electric Capital Corporation Credit Facility [Member]
Dec. 31, 2012
General Electric Capital Corporation Credit Facility [Member]
Jun. 30, 2013
General Electric Capital Corporation Credit Facility [Member]
Maximum [Member]
Jun. 30, 2013
General Electric Capital Corporation Credit Facility [Member]
Direct Borrowings [Member]
Dec. 31, 2012
General Electric Capital Corporation Credit Facility [Member]
Direct Borrowings [Member]
Jun. 30, 2013
General Electric Capital Corporation Credit Facility [Member]
Index Loan [Member]
Jun. 30, 2012
General Electric Capital Corporation Credit Facility [Member]
Index Loan [Member]
Dec. 31, 2012
General Electric Capital Corporation Credit Facility [Member]
Index Loan [Member]
Jun. 30, 2013
GE Canada Finance Holding Company Credit Facility [Member]
Jun. 30, 2013
Line of Credit [Member]
Jun. 30, 2013
Revolving credit facilities [Member]
Dec. 31, 2012
Revolving credit facilities [Member]
Jun. 30, 2013
Other [Member]
Dec. 31, 2012
Other [Member]
Debt Instrument [Line Items]                                          
Revolving credit facilities                                   $ 68,334,000 $ 40,453,000    
Other                                       133,000 195,000
Total debt 68,467,000   40,648,000                                    
Current maturities of debt 68,437,000   40,573,000                                    
Long-term debt 30,000   75,000                                    
Deferred Financing Costs [Abstract]                                          
Deferred financing costs 3,300,000   2,600,000                                    
Amount capitalized in relation to amendment of revolving credit facility 1,300,000                                        
Amortization of financing costs in 2013 400,000                                        
Amortization of financing costs in 2014 700,000                                        
Amortization of financing costs in 2015 700,000                                        
Amortization of financing costs in 2016 700,000                                        
Amortization of financing costs in 2017 and thereafter 800,000                                        
Line of Credit Facility [Line Items]                                          
Maximum borrowing capacity 250,000,000 200,000,000                           10,000,000 10,000,000        
Expiration date Mar. 01, 2018                                        
Margin on variable rate (in hundredths)       1.50% 2.00% 0.50% 1.00%                            
Unused fee (in hundredths) 0.25%                                        
Additional available borrowing capacity 126,800,000                                        
Outstanding borrowings under credit facility               68,300,000 40,400,000   68,000,000 25,000,000 300,000   15,400,000 0          
Weighted average interest rate (in hundredths)               1.70% 2.70%   1.70% 2.00% 3.75%   4.00%            
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)                                        
Conditions for required financial covenants, maximum borrowing availability                   25,000,000                      
Average daily loan balance outstanding                         $ 4,900,000 $ 6,000,000 $ 6,100,000