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Financial Commitments (Narrative) (Details) - USD ($)
6 Months Ended
Aug. 18, 2020
Jun. 30, 2022
Dec. 31, 2021
Jun. 15, 2021
Apr. 20, 2017
Jun. 15, 2016
BMO Harris Bank            
Debt Instrument [Line Items]            
Applicable margin on overdue amounts (as a percent) 2.00%          
First Lien | BMO Harris Bank            
Debt Instrument [Line Items]            
Net leverage ratio (maximum) 1.35          
2020 Revolver | BMO Harris Bank            
Debt Instrument [Line Items]            
Net leverage ratio (maximum) 2.75 2.25        
Weighted-average annual interest rate on borrowings   6.91%        
Remaining borrowing capacity   $ 175,000,000        
Line of Credit | 2020 Credit Agreement | BMO Harris Bank            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 425,000,000          
Periodic payment principal percentage 0.25%          
Unsecured Debt | BMO Harris Bank            
Debt Instrument [Line Items]            
Total net leverage ratio (maximum) 3.50          
Fixed charge coverage ratio (maximum) 2.00          
Convertible Notes            
Debt Instrument [Line Items]            
Current principal amount       $ 69,900,000    
Interest rate           2.875%
Senior Notes | 2017 Senior Notes            
Debt Instrument [Line Items]            
Current principal amount   $ 500,000,000 $ 500,000,000      
Senior Notes | Private Placement | 2017 Senior Notes            
Debt Instrument [Line Items]            
Interest rate         6.875%  
Face amount         $ 500,000,000  
Redemption price, change of control triggering event (as a percent)   101.00%        
Revolving Credit Facility | 2020 Credit Agreement | BMO Harris Bank            
Debt Instrument [Line Items]            
Increase in line of credit $ 173,500,000          
Accordion feature, percentage of LTM EBITDA 50.00%          
Revolving Credit Facility | 2020 Revolver            
Debt Instrument [Line Items]            
Unamortized debt issuance costs   $ 1,800,000 $ 2,100,000      
Revolving Credit Facility | Line of Credit | 2020 Credit Agreement | BMO Harris Bank            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 175,000,000          
Letters of Credit | Line of Credit | 2020 Credit Agreement | BMO Harris Bank            
Debt Instrument [Line Items]            
Maximum borrowing capacity 75,000,000          
Bridge Loan | Line of Credit | 2020 Credit Agreement | BMO Harris Bank            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 10,000,000          
Secured Debt | Junior Lien | BMO Harris Bank            
Debt Instrument [Line Items]            
Total net leverage ratio (maximum) 3.50          
Federal Funds Rate | 2020 Credit Agreement | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.50%          
LIBOR | 2020 Credit Agreement | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.00%          
LIBOR | Term Loan B | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 4.75%          
LIBOR | 2020 Revolver | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 4.75%          
LIBOR | Minimum | Term Loan B | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 4.50%          
LIBOR | Minimum | 2020 Revolver | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 4.25%          
LIBOR | Maximum | Term Loan B | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 4.75%          
LIBOR | Maximum | 2020 Revolver | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 4.75%          
Base Rate | Term Loan B | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 3.75%          
Base Rate | 2020 Revolver | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 3.75%          
Base Rate | Minimum | Term Loan B | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 3.50%          
Base Rate | Minimum | 2020 Revolver | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 3.25%          
Base Rate | Maximum | Term Loan B | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 3.75%          
Base Rate | Maximum | 2020 Revolver | BMO Harris Bank            
Debt Instrument [Line Items]            
Basis spread on variable rate 3.75%