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Debt Asset-Based Revolving Credit Facility (Details) - USD ($)
$ in Thousands
7 Months Ended 12 Months Ended
May. 15, 2015
Mar. 09, 2015
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Line of Credit Facility [Line Items]            
Pension contributions $ 40,000 $ 10,000   $ 54,257 $ 12,071 $ 10,739
Term Loan Due 2022 [Member] | Medium-term Notes [Member]            
Line of Credit Facility [Line Items]            
Term Loan, Face Amount $ 50,000          
Term Loan, Interest Rate During Period     1.96%      
Term Loan, interest rate during period with patronage credits     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     $ 258,600 $ 258,600    
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     $ 5,600 $ 5,600 $ 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%