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Financing Arrangements (Narrative) (Details) - USD ($)
Apr. 22, 2016
Jun. 30, 2016
Dec. 31, 2015
Oct. 21, 2015
Aug. 13, 2015
Oct. 23, 2014
Maximum            
Line of Credit Facility [Line Items]            
Capital lease obligations         $ 50,000,000  
Revolving credit            
Line of Credit Facility [Line Items]            
Carrying amount   $ 155,600,000 $ 169,000,000      
Term Loan            
Line of Credit Facility [Line Items]            
Carrying amount   25,600,000 $ 27,900,000      
The Amended Credit Agreement | Revolving credit            
Line of Credit Facility [Line Items]            
Term of debt instrument 7 years          
Inventory advance rate percentage 65.00%         50.00%
The Amended Credit Agreement | LIBOR | Revolving credit | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 1.50%          
The Amended Credit Agreement | LIBOR | Revolving credit | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 2.50%          
The Amended Credit Agreement | LIBOR | Term Loan | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 2.00%          
The Amended Credit Agreement | LIBOR | Term Loan | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 3.00%          
The Amended Credit Agreement | Prime lending rate | Revolving credit | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) (0.25%)          
The Amended Credit Agreement | Prime lending rate | Revolving credit | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) (1.25%)          
The Amended Credit Agreement | Prime lending rate | Term Loan | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) (0.75%)          
The Amended Credit Agreement | Prime lending rate | Term Loan | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 0.25%          
The Amended Credit Agreement | Canadian deposit offered rate | Revolving Credit Facility, Canadian Sub-Limit | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 1.50%          
The Amended Credit Agreement | Canadian deposit offered rate | Revolving Credit Facility, Canadian Sub-Limit | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 2.50%          
The Amended Credit Agreement | Canadian prime lending rate | Revolving Credit Facility, Canadian Sub-Limit | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 0.00%          
The Amended Credit Agreement | Canadian prime lending rate | Revolving Credit Facility, Canadian Sub-Limit | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 1.00%          
The Amended Credit Agreement | US base rate | Revolving Credit Facility, Canadian Sub-Limit | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 0.00%          
The Amended Credit Agreement | US base rate | Revolving Credit Facility, Canadian Sub-Limit | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 1.00%          
Amendment No. 1 to the Amended Credit Agreement | Revolving credit            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity $ 300,000,000.0          
Amount drawn $ 35,000,000          
Inventory advance rate percentage to be reduced to 50.00%          
Term over which inventory advance rate percentage reduces 36 months          
Term over which basis spread on variable interest rate reduces 36 months          
Amendment No. 1 to the Amended Credit Agreement | Revolving Credit Facility, Canadian Sub-Limit            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity $ 35,000,000.0          
Amendment No. 1 to the Amended Credit Agreement | Revolving Credit Facility, European Sub-Limit            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity 25,000,000.0          
Amendment No. 1 to the Amended Credit Agreement | Term Loan            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity $ 35,000,000.0          
Amendment No. 1 to the Amended Credit Agreement | LIBOR | Revolving credit            
Line of Credit Facility [Line Items]            
Basis spread on variable interest rate - plus (minus) 3.50%          
Southwest Steel Processing LLC | Arkansas Development Finance Authority            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity       $ 11,000,000.0    
Amount drawn   5,600,000        
Machinery and Equipment            
Line of Credit Facility [Line Items]            
Capital lease obligations   $ 17,400,000