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Financial Commitments (Narrative) (Details)
12 Months Ended
Aug. 18, 2020
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
Dec. 31, 2021
USD ($)
Aug. 19, 2020
USD ($)
Debt Instrument [Line Items]                
Loan outstanding   $ 1,025,465,000 $ 834,476,000          
Restricted cash held to repay outstanding debt   $ 69,900,000            
Initial conversion rate   0.0330579            
BMO Harris Bank                
Debt Instrument [Line Items]                
Increase in applicable margin on overdue amounts upon default 2.00%              
Credit Facility 2020                
Debt Instrument [Line Items]                
Loan outstanding   $ 0            
Credit Facility 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Net leverage ratio (maximum) 2.75              
Weighted-average annual interest rate on borrowings   6.74%            
Available borrowing capacity   $ 175,000,000            
First Lien | BMO Harris Bank                
Debt Instrument [Line Items]                
Net leverage ratio (maximum) 1.35              
Equity Component                
Debt Instrument [Line Items]                
Unamortized debt issuance costs   1,500,000            
Liability Component                
Debt Instrument [Line Items]                
Unamortized debt issuance costs   5,100,000            
Forecast | Credit Facility 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Net leverage ratio (maximum)           2.25    
Line of Credit | Credit Agreement 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 425,000,000.0              
Premium percentage 1.00%              
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]                
Face amount   200,000,000            
Loan outstanding   $ 67,878,000 182,292,000          
Interest rate (as a percent)   2.875%            
Repurchased face amount               $ 130,100,000
Aggregate repurchase price               $ 132,400,000
Conversion price (in dollars per share) | $ / shares   $ 30.25            
Convertible Debt | Equity Component                
Debt Instrument [Line Items]                
Unamortized debt issuance costs   $ 1,543,000 1,543,000          
Conversion feature   46,800,000 46,800,000          
Convertible Debt | Liability Component                
Debt Instrument [Line Items]                
Unamortized debt issuance costs   5,051,000 5,051,000          
Face amount   69,918,000 200,000,000          
Issuance of convertible notes     153,200,000          
2017 Senior Notes | 2017 Senior Notes                
Debt Instrument [Line Items]                
Loan outstanding   495,271,000 494,365,000          
2017 Senior Notes | Private Placement | 2017 Senior Notes                
Debt Instrument [Line Items]                
Face amount   $ 500,000,000            
Interest rate (as a percent)   6.875%            
Redemption price, change of control triggering event (as a percent)   101.00%            
Equipment Financing Loans                
Debt Instrument [Line Items]                
Loan outstanding   $ 36,900,000 27,700,000          
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]                
Term of debt   7 years            
Equipment Financing Loans | Forecast                
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]                
Balloon payments         $ 6,300,000   $ 12,400,000  
Mortgages                
Debt Instrument [Line Items]                
Loan outstanding   $ 10,700,000 11,500,000          
Interest rate (as a percent)   3.50%            
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]                
Term of debt   10 years            
Mortgages | Forecast                
Equipment Financing, Mortgages And Acquisition-Related Notes [Abstract]                
Balloon payments       $ 6,800,000     $ 2,900,000  
Minimum | Equipment Financing Loans                
Debt Instrument [Line Items]                
Interest rate (as a percent)   2.74%            
Maximum | Equipment Financing Loans                
Debt Instrument [Line Items]                
Interest rate (as a percent)   3.89%            
Credit Facility | Credit Facility 2020                
Debt Instrument [Line Items]                
Unamortized debt issuance costs   $ 2,600,000            
Credit Facility | 2017 Credit Facility                
Debt Instrument [Line Items]                
Unamortized debt issuance costs     3,700,000          
Maximum borrowing capacity   $ 350,000,000            
Weighted-average annual interest rate on borrowings   3.55%            
Loan outstanding     $ 114,000,000          
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 | Line of Credit | Credit Agreement 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 175,000,000.0              
Letters Of Credit | 2017 Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 150,000,000            
Letters Of Credit | Line of Credit | Credit Agreement 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Maximum borrowing capacity 75,000,000.0              
Bridge Loan | 2017 Credit Facility                
Debt Instrument [Line Items]                
Face amount   $ 10,000,000            
Bridge Loan | Line of Credit | Credit Agreement 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 10,000,000.0              
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%              
LIBOR | Credit Facility 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Basis points added to reference rate (as a percent)) 4.75%              
LIBOR | Credit Agreement 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Basis points added to reference rate (as a percent)) 1.00%              
LIBOR | Term Loan B | BMO Harris Bank                
Debt Instrument [Line Items]                
Basis points added to reference rate (as a percent)) 4.75%              
LIBOR | Mortgages                
Debt Instrument [Line Items]                
Basis points added to reference rate (as a percent))   3.00%            
LIBOR | Minimum | Credit Facility 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Basis points added to reference rate (as a percent)) 4.25%              
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 | Credit Facility 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Basis points added to reference rate (as a percent)) 4.75%              
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 | Credit Facility 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Basis points added to reference rate (as a percent)) 3.75%              
Base Rate | Term Loan B | BMO Harris Bank                
Debt Instrument [Line Items]                
Basis points added to reference rate (as a percent)) 3.75%              
Base Rate | Minimum | Credit Facility 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Basis points added to reference rate (as a percent)) 3.25%              
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 | Credit Facility 2020 | BMO Harris Bank                
Debt Instrument [Line Items]                
Basis points added to reference rate (as a percent)) 3.75%              
Base Rate | Maximum | Term Loan B | BMO Harris Bank                
Debt Instrument [Line Items]                
Basis points added to reference rate (as a percent)) 3.75%