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Credit Arrangements (Details 2)
 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 28, 2012
Senior Notes
USD ($)
Dec. 31, 2012
Senior Notes
USD ($)
Dec. 31, 2012
Senior Notes
Minimum
USD ($)
Dec. 31, 2012
Notes Agreement
Dec. 31, 2012
Notes Agreement
Minimum
Dec. 28, 2012
Notes Agreement
Maximum
USD ($)
Dec. 31, 2012
Notes Agreement
Maximum
Nov. 12, 2010
Subordinated Promissory Note
Rockford
USD ($)
Dec. 18, 2009
Subordinated Promissory Note
JCG
USD ($)
Dec. 31, 2012
Note A
Rockford
USD ($)
Nov. 12, 2010
Note A
Rockford
USD ($)
Nov. 12, 2010
Note B
Rockford
USD ($)
Dec. 31, 2012
Credit Agreement
LIBOR
Dec. 31, 2012
Credit Agreement
Base rate
Dec. 31, 2012
Credit Agreement
Federal funds rate
Dec. 31, 2012
Credit Agreement
Prime rate
Dec. 31, 2012
Credit Agreement
Minimum
Dec. 31, 2012
Credit Agreement
Revolving line of credit
USD ($)
Dec. 28, 2012
Credit Agreement
Revolving line of credit
USD ($)
Dec. 31, 2012
Credit Agreement
Revolving line of credit
Minimum
USD ($)
Dec. 31, 2012
Canadian Credit Facility
Commercial letters of credit
CAD
Dec. 31, 2011
Canadian Credit Facility
Commercial letters of credit
CAD
Dec. 31, 2012
Canadian Credit Facility
Commercial letters of credit
Maximum
Credit arrangements                                              
Maximum borrowing capacity                                     $ 75,000,000   10,000,000    
Incremental maximum borrowing capacity                                     50,000,000        
Variable rate basis                         LIBOR Base Rate Federal Funds Rate prime rate              
Basis spread on variable rate (as a percent)                             0.50%                
Prepayment to be paid on debt     5,000,000                                 5,000,000      
Additional borrowings 50,000,000                                            
Interest rate (as a percent)   3.65%                                          
Additional borrowings to be incurred during the first three years of the debt agreement           25,000,000                                  
Number of years in which additional notes can be issued       3 years                                      
Maturity term of debt instrument             10 years                                
Restrictions on investments, change of control provisions and provisions as a percentage of total assets to be disposed off         20.00%                       20.00%            
Total commercial letters of credit outstanding                                   4,808,000     1,364,000 4,036,000  
Available borrowing capacity                                   70,192,000     8,636,000    
Term of credit facility                                             5 years
Annual fee (as a percent)                                         1.00%    
Required principal payment   7,100,000                                          
Initial principal amount               16,712,000 53,500,000   9,669,000 7,043,000                      
Amount outstanding                   5,000,000                          
Payment that the entity was required to make to cancel the notes                   $ 1,500,000