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Debt and Financing Arrangements (Details)
$ / shares in Units, shares in Millions
3 Months Ended 12 Months Ended
Aug. 03, 2022
USD ($)
Jul. 29, 2021
USD ($)
installment
Nov. 03, 2020
USD ($)
$ / shares
shares
Oct. 29, 2020
$ / shares
Jul. 02, 2020
USD ($)
Mar. 04, 2020
USD ($)
installment
Mar. 31, 2023
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2022
USD ($)
Aug. 02, 2022
USD ($)
Mar. 31, 2022
USD ($)
Mar. 04, 2021
USD ($)
Debt Instrument [Line Items]                        
Restricted cash             $ 1,100,000   $ 1,100,000   $ 1,100,000  
Outstanding debt             148,304,000   174,276,000      
Derivative Assets             3,970,000   $ 2,707,000      
New Term Loan Debt Facility | Senior Notes                        
Debt Instrument [Line Items]                        
Term loan, face value               $ 300,000,000        
Percentage of face amount               99.50        
Quarterly principal amortization payments               $ 750,000        
Term loan repaid             273,800,000          
Amount of voting equity interests of domestic subsidiaries guaranteed (percent)               100        
Amount of voting equity interests of foreign owned subsidiaries guaranteed (percent)               65        
Outstanding debt             5,800,000          
New Term Loan Debt Facility | Line of Credit | LIBOR                        
Debt Instrument [Line Items]                        
Applicable margin on interest rate               2.75%        
New Term Loan Debt Facility | Line of Credit | LIBOR | Minimum                        
Debt Instrument [Line Items]                        
Applicable margin on interest rate               1.00%        
New Term Loan Debt Facility | Line of Credit | Base Rate                        
Debt Instrument [Line Items]                        
Applicable margin on interest rate               1.75%        
Accounts Receivable Securitization Facility | Line of Credit | Secured Debt                        
Debt Instrument [Line Items]                        
Current borrowing capacity             101,400,000          
Letters of credit outstanding             48,600,000          
Accounts Receivable Securitization Facility | Regions Bank | Line of Credit | Secured Debt                        
Debt Instrument [Line Items]                        
Current borrowing capacity $ 150,000,000                 $ 110,000,000    
Inventory-Based Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Covenant amount             23,800,000          
Inventory-Based Revolving Credit Facility | Regions Bank | Line of Credit | Secured Debt                        
Debt Instrument [Line Items]                        
Term loan, face value $ 50,000,000                      
Letters of credit outstanding             26,200,000          
Borrowing base percentage, coal inventory 85                      
Borrowing base percentage, parts and supplies inventory 85                      
Borrowing base, percentage of clause 35                      
Percent of eligible cash 100.00%                      
Covenant amount $ 100,000,000                      
Equipment financing arrangement | Secured Debt                        
Debt Instrument [Line Items]                        
Term loan, face value   $ 23,500,000       $ 53,600,000            
Number of monthly payments | installment   42       48            
Interest rate   7.35%       6.34%            
Tax Exempt Bonds                        
Debt Instrument [Line Items]                        
Term loan, face value             98,100,000          
Series 2020 Tax Exempt Bonds                        
Debt Instrument [Line Items]                        
Term loan, face value         $ 53,100,000              
Interest rate         5.00%              
Mandatory tender percentage         100.00%              
Series 2021 Tax Exempt Bonds                        
Debt Instrument [Line Items]                        
Term loan, face value                       $ 45,000,000.0
Interest rate                       4.125%
Convertible Notes                        
Debt Instrument [Line Items]                        
Term loan, face value     $ 155,300,000                  
Interest rate     5.25%                  
Net proceeds of convertible debt     $ 132,700,000                  
Total interest expense             2,300,000          
Contractual interest coupon             2,000,000.0          
Amortization of debt discount             300,000          
Principal amount of convertible notes             13,200,000          
Cash on convertible notes             58,400,000          
Deferred Offering Costs     $ 5,100,000                  
Loss on debt conversion             1,100,000          
Convertible Notes | Maximum                        
Debt Instrument [Line Items]                        
Total interest expense             100,000          
Capped Call Transactions                        
Debt Instrument [Line Items]                        
Initial strike price (in dollars per share) | $ / shares     $ 37.325                  
Number of underlying shares | shares     4.2                  
Cap price | $ / shares       $ 52.255                
Capped call, transaction cost     $ 17,500,000                  
Debt instrument capped call transaction intrinsic value             $ 62,100,000