XML 70 R57.htm IDEA: XBRL DOCUMENT v3.10.0.1
Debt and Financing Arrangements (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 03, 2018
Sep. 25, 2017
Apr. 27, 2017
Mar. 07, 2017
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Line of Credit Facility [Line Items]                
Fair value of derivative assets         $ 50,409,000 $ 50,409,000   $ 55,550,000
Debt financing costs           529,000 $ 8,900,000  
Debt restructuring costs           50,000 2,061,000  
Interest Rate Swap                
Line of Credit Facility [Line Items]                
Interest rate swaps settlements gains         300,000 500,000    
Other Noncurrent Assets | Interest Rate Swap                
Line of Credit Facility [Line Items]                
Fair value of derivative assets         $ 4,200,000 4,200,000    
Senior Notes | New Term Loan Debt Facility                
Line of Credit Facility [Line Items]                
Debt instrument, face amount   $ 300,000,000            
Basis spread on variable rate   3.25%            
Call premium rate   1.00%            
Net cash proceeds of from debt issuances and other non-ordinary sales or dispositions (percent)       100.00%        
Default to indebtedness       $ 50,000,000        
Default to surety, reclamation or similar bond       50,000,000        
Default to uninsured judgment       50,000,000        
Uninsured losses or proceedings against       50,000,000        
Debt financing costs           500,000    
Senior Notes | New Term Loan Debt Facility | LIBOR                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 2.75% 1.00%            
Basis spread on variable rate, floor 1.00%              
Call premium rate 1.00%              
Senior Notes | New Term Loan Debt Facility | Base Rate                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 1.75%              
Line of Credit | Superpriority Debtor-in Possession Credit Agreement                
Line of Credit Facility [Line Items]                
Debt financing costs             $ 8,900,000  
New Term Loan Debt Facility | Senior Notes                
Line of Credit Facility [Line Items]                
Debt instrument, face amount       $ 300,000,000        
Percentage of face amount       99.50%        
Quarterly amortization payments       $ 750,000        
Amount of voting equity interests of domestic subsidiaries guaranteed (percent)       100.00%        
Amount of voting equity interests of foreign owned subsidiaries guaranteed (percent)       65.00%        
New Term Loan Debt Facility | Senior Notes | LIBOR                
Line of Credit Facility [Line Items]                
Basis spread on variable rate         2.75%      
New Term Loan Debt Facility | Senior Notes | Base Rate                
Line of Credit Facility [Line Items]                
Basis spread on variable rate   2.25%            
Line of Credit | Secured Debt                
Line of Credit Facility [Line Items]                
Current borrowing capacity         $ 79,500,000 79,500,000    
Letters of credit outstanding         75,300,000 75,300,000    
Line of Credit | Secured Debt | Regions Bank                
Line of Credit Facility [Line Items]                
Debt instrument, face amount     $ 40,000,000          
Maximum borrowing capacity     200,000,000          
Current borrowing capacity         160,000,000 160,000,000    
Covenant minimum amount     $ 175,000,000          
Letters of credit outstanding         35,200,000 35,200,000    
Percentage of coal inventory borrowing base     85.00%          
Percentage of parts and supplies inventory borrowing base     85.00%          
Percentage of clause borrowing base     35.00%          
Percent of eligible cash     100.00%          
Covenant amount (less than)     $ 250,000,000          
Additional availability for borrowings         $ 4,800,000 $ 4,800,000    
Line of Credit | Secured Debt | LIBOR | Regions Bank | Minimum                
Line of Credit Facility [Line Items]                
Basis spread on variable rate     2.25%          
Line of Credit | Secured Debt | LIBOR | Regions Bank | Maximum                
Line of Credit Facility [Line Items]                
Percentage of clause borrowing base     2.50%          
Line of Credit | Secured Debt | Base Rate | Regions Bank | Minimum                
Line of Credit Facility [Line Items]                
Basis spread on variable rate     1.25%          
Line of Credit | Secured Debt | Base Rate | Regions Bank | Maximum                
Line of Credit Facility [Line Items]                
Basis spread on variable rate     1.50%