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Financial Commitments (Narrative) (Details)
1 Months Ended 12 Months Ended
Aug. 18, 2020
USD ($)
Oct. 31, 2022
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Apr. 01, 2023
Mar. 31, 2023
Sep. 30, 2022
Jan. 01, 2022
Jun. 15, 2021
USD ($)
Apr. 20, 2017
USD ($)
Jun. 15, 2016
Debt Instrument [Line Items]                            
Current maturities of long-term debt     $ 70,285,000 $ 24,406,000                    
Current principal amount     972,419,000                      
Amount outstanding     958,439,000 993,654,000                    
BMO Harris Bank                            
Debt Instrument [Line Items]                            
Increase in applicable margin on overdue amounts upon default (as a percent) 2.00%                          
First Lien | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Net leverage ratio (maximum) 1.35                          
Line of Credit | Credit Agreement 2020 | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity $ 425,000,000                          
Initial principal amount installment percentage 0.25%                          
Unsecured Debt | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Fixed charge coverage ratio (maximum) 2.00                          
Convertible Debt                            
Debt Instrument [Line Items]                            
Current principal amount                       $ 69,900,000    
Interest rate (as a percent)                           2.875%
2017 Senior Notes | 2017 Senior Notes                            
Debt Instrument [Line Items]                            
Current principal amount     500,000,000 500,000,000                    
Amount outstanding     $ 497,289,000 496,244,000                    
2017 Senior Notes | Private Placement | 2017 Senior Notes                            
Debt Instrument [Line Items]                            
Interest rate (as a percent)                         6.875%  
Face amount                         $ 500,000,000  
Redemption price, change of control triggering event (as a percent)     101.00%                      
Equipment Financing Loans                            
Debt Instrument [Line Items]                            
Amount outstanding     $ 37,000,000 $ 41,700,000                    
Term of debt     5 years                      
Mortgages                            
Debt Instrument [Line Items]                            
Interest rate (as a percent)     2.25% 2.25%                    
Amount outstanding     $ 11,600,000 $ 14,600,000                    
Term of debt     10 years                      
Term Loan B                            
Debt Instrument [Line Items]                            
Current maturities of long-term debt     $ 44,000,000                      
Current principal amount     415,438,000 419,688,000                    
Amount outstanding     $ 404,169,000 406,335,000                    
Minimum | Equipment Financing Loans                            
Debt Instrument [Line Items]                            
Interest rate (as a percent)     2.54%                      
Maximum | Equipment Financing Loans                            
Debt Instrument [Line Items]                            
Interest rate (as a percent)     7.32%                      
Credit Facility                            
Debt Instrument [Line Items]                            
Unamortized debt issuance costs     $ 1,600,000 2,100,000                    
Amount outstanding     $ 0 $ 27,000,000                    
Credit Facility | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Net leverage ratio (maximum) 2.75 2.75 3.50             2.25 2.25      
Weighted-average annual interest rate on borrowings (as a percent)     8.80%                      
Available borrowing capacity     $ 175,000,000                      
Credit Facility | BMO Harris Bank | Subsequent Event                            
Debt Instrument [Line Items]                            
Net leverage ratio (maximum)                 3.75          
Credit Facility | Credit Agreement 2020 | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Increase in line of credit allowed amount $ 173,500,000                          
Accordion feature percentage of LTM EBITDA 50.00%                          
Credit Facility | Forecast | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Net leverage ratio (maximum)         2.25 2.50 3.00 2.25            
Credit Facility | Line of Credit | Credit Agreement 2020 | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity $ 175,000,000                          
Letters Of Credit | Line of Credit | Credit Agreement 2020 | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity 75,000,000                          
Bridge Loan | Line of Credit | Credit Agreement 2020 | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity $ 10,000,000                          
Secured Debt | Unsecured Debt | BMO Harris Bank | Junior Lien                            
Debt Instrument [Line Items]                            
Total net leverage ratio (maximum) 3.50                          
Federal Funds Rate | Credit Agreement 2020 | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent) 0.50% 0.50%                        
LIBOR | Credit Agreement 2020 | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent) 1.00%                          
LIBOR | Minimum | Term Loan B | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent) 4.50%                          
LIBOR | Maximum | Term Loan B | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent) 4.75%                          
Base Rate | Minimum | Term Loan B | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent) 3.50%                          
Base Rate | Maximum | Term Loan B | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent) 3.75%                          
Base Rate | Credit Facility | Minimum | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent) 3.25%                          
Base Rate | Credit Facility | Maximum | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent) 3.75%                          
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Credit Agreement 2020 | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent)   1.00%                        
Basis spread adjustment (as a percent)   0.10%                        
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Mortgages                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent)     2.00% 2.00%                    
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Credit Facility | Minimum | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent) 4.25%                          
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Credit Facility | Maximum | BMO Harris Bank                            
Debt Instrument [Line Items]                            
Basis points added to reference rate (as a percent) 4.75%