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Asset-Based Revolving Credit Facility (Details) - USD ($)
$ in Thousands
2 Months Ended 4 Months Ended 9 Months Ended
May. 15, 2015
Mar. 09, 2015
May. 15, 2015
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Line of Credit Facility [Line Items]              
Pension contributions $ 40,000 $ 10,000 $ 50,000   $ 53,701 $ 11,675  
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       1.95%      
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       $ 292,700 $ 292,700    
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         1.25%    
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         1.75%    
Asset-based revolving credit facility [Member] | Base Rate [Member] | Minimum [Member]              
Line of Credit Facility [Line Items]              
Basis spread on variable interest rate         0.25%    
Asset-based revolving credit facility [Member] | Base Rate [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Basis spread on variable interest rate         0.75%