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Financial Commitments (Narrative) (Details)
3 Months Ended
Aug. 18, 2020
USD ($)
Mar. 31, 2021
USD ($)
$ / shares
Mar. 31, 2022
Dec. 31, 2020
USD ($)
Aug. 19, 2020
USD ($)
Apr. 20, 2017
USD ($)
Jun. 15, 2016
USD ($)
Debt Instrument [Line Items]              
Long-term debt   $ 1,025,671,000   $ 1,025,465,000      
Conversion ratio   0.0330579          
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              
Debt Instrument [Line Items]              
Long-term debt   $ 0   0      
2020 Revolver | BMO Harris Bank              
Debt Instrument [Line Items]              
Net leverage ratio (maximum) 2.75            
Weighted-average annual interest rate on borrowings   6.50%          
Remaining borrowing capacity   $ 175,000,000          
Forecast | 2020 Revolver | BMO Harris Bank              
Debt Instrument [Line Items]              
Net leverage ratio (maximum)     2.25        
Line of Credit | 2020 Credit Agreement | BMO Harris Bank              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 425,000,000.0            
Premium fee (as a percent) 1.00%            
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]              
Face amount             $ 200,000,000
Interest rate             2.875%
Aggregate principal repurchase face amount         $ 130,100,000    
Aggregate principal repurchase amount         $ 132,400,000    
Current principal amount   69,918,000   69,918,000      
Long-term debt   $ 68,977,000   67,878,000      
Conversion price (in dollars per share) | $ / shares   $ 30.25          
Senior Notes | 2017 Senior Notes              
Debt Instrument [Line Items]              
Current principal amount   $ 500,000,000   500,000,000      
Long-term debt   $ 495,508,000   495,271,000      
Senior Notes | Private Placement | 2017 Senior Notes              
Debt Instrument [Line Items]              
Face amount           $ 500,000,000  
Interest rate           6.875%  
Redemption price, change of control triggering event (as a percent)   101.00%          
Revolving Credit Facility | 2017 Credit Facility              
Debt Instrument [Line Items]              
Unamortized debt issuance costs       $ 2,600,000      
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   $ 2,500,000          
Revolving Credit Facility | Line of Credit | 2020 Credit Agreement | BMO Harris Bank              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 175,000,000.0            
Secured Debt | Junior Lien | BMO Harris Bank              
Debt Instrument [Line Items]              
Total net leverage ratio (maximum) 3.50            
Letters Of Credit | Line of Credit | 2020 Credit Agreement | BMO Harris Bank              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 75,000,000.0            
Bridge Loan | Line of Credit | 2020 Credit Agreement | BMO Harris Bank              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 10,000,000.0            
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%