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Asset-Based Revolving Credit Facility (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 6 Months Ended
May. 15, 2015
Mar. 09, 2015
Jun. 30, 2015
May. 15, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Line of Credit Facility [Line Items]              
Pension contributions $ 40,000 $ 10,000   $ 50,000 $ 53,203 $ 780  
Term Loan Due 2022 [Member] | Medium-term notes [Member]              
Line of Credit Facility [Line Items]              
Term Loan, Face Amount $ 50,000     $ 50,000      
Term Loan, Interest Rate During Period     1.94%        
Term Loan Interest Rate Effective Percentage, With Patronage Credits     1.20%   1.20%    
Term Loan Due 2022 [Member] | Medium-term notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]              
Line of Credit Facility [Line Items]              
Basis spread on variable interest rate     1.75%        
Term Loan Due 2022 [Member] | Medium-term notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Basis spread on variable interest rate     2.25%        
Term Loan Due 2022 [Member] | Medium-term notes [Member] | Base Rate [Member] | Minimum [Member]              
Line of Credit Facility [Line Items]              
Basis spread on variable interest rate     0.75%        
Term Loan Due 2022 [Member] | Medium-term notes [Member] | Base Rate [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Basis spread on variable interest rate     1.25%        
Asset-based revolving credit facility [Member]              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity     $ 350,000   $ 350,000    
Fixed charge coverage ratio requirement, if availability falls below 10% of aggregate lending commitments (as a percent)         100.00%    
Threshold of availability as a percentage of aggregate lending commitments, below which 1:1 fixed charge coverage ratio must be met     10.00%   10.00%    
Threshold of availability, below which 1:1 fixed charge coverage ratio must be met     $ 35,000   $ 35,000    
Current availability     $ 314,700   $ 314,700    
Dividend restriction, single threshold, percentage of aggregate Revolver Commitments     25.00%   25.00%    
Dividend restriction, combination thresholds, percentage of aggregate Revolver Commitments     15.00%   15.00%    
Dividend restriction, combination thresholds, fixed-charge coverage ratio (as a percent)         100.00%    
Amount outstanding     $ 0   $ 0   $ 0
Letters of credit outstanding     $ 8,000   $ 8,000   $ 8,000
Asset-based revolving credit facility [Member] | Minimum [Member]              
Line of Credit Facility [Line Items]              
Commitment fee rate         0.25%    
Asset-based revolving credit facility [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Commitment fee rate         0.375%    
Asset-based revolving credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]              
Line of Credit Facility [Line Items]              
Basis spread on variable interest rate         1.50%    
Asset-based revolving credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Basis spread on variable interest rate         2.00%    
Asset-based revolving credit facility [Member] | Base Rate [Member] | Minimum [Member]              
Line of Credit Facility [Line Items]              
Basis spread on variable interest rate         0.50%    
Asset-based revolving credit facility [Member] | Base Rate [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Basis spread on variable interest rate         1.00%