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LONG-TERM OBLIGATIONS - 2017 Credit Agreement (Details)
3 Months Ended 9 Months Ended 21 Months Ended
Mar. 07, 2019
USD ($)
Feb. 28, 2018
Aug. 17, 2017
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2017
USD ($)
Debt Instrument [Line Items]                        
Letters of credit outstanding, amount             $ 81,900,000       $ 80,100,000  
2017 Credit Agreement                        
Debt Instrument [Line Items]                        
Letters of credit outstanding, amount             0       0  
Percentage of capital stock of foreign subsidiary pledged as collateral for borrowings (as a percent)                       65.00%
Additional Credit Agreement 2017                        
Debt Instrument [Line Items]                        
Letters of credit outstanding, amount             35,100,000       34,800,000  
Letter of Credit | 2017 Credit Agreement                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity             400,000,000          
Senior secured term loans | Secured Debt | 2017 Credit Agreement                        
Debt Instrument [Line Items]                        
Face amount of debt             600,000,000          
Senior secured term loans | Secured Debt | Original Term Loan                        
Debt Instrument [Line Items]                        
Face amount of debt                       $ 400,000,000
Senior secured term loans | Secured Debt | 2019 Term Loan                        
Debt Instrument [Line Items]                        
Face amount of debt $ 200,000,000                      
Line of Credit | 2017 Credit Agreement                        
Debt Instrument [Line Items]                        
Incremental borrowing capacity                       $ 300,000,000
Line of Credit | 2017 Credit Agreement | Forecast                        
Debt Instrument [Line Items]                        
Incremental borrowing capacity               $ 150,000,000        
Line of Credit | Secured Debt | 2017 Credit Agreement                        
Debt Instrument [Line Items]                        
Increase (decrease) in interest rate   (0.025%) (0.025%)                  
Long-term debt             $ 581,300,000       $ 585,500,000  
Debt, weighted average interest rate             3.00%       4.10%  
Line of Credit | Secured Debt | Original Term Loan                        
Debt Instrument [Line Items]                        
Long-term debt             $ 385,000,000.0          
Line of Credit | Secured Debt | 2019 Term Loan                        
Debt Instrument [Line Items]                        
Long-term debt             196,300,000          
Line of Credit | Revolving Credit Facility | 2017 Credit Agreement                        
Debt Instrument [Line Items]                        
Line of credit             $ 0       $ 0  
Springing covenant threshold                       30.00%
Debt instrument covenant minimum interest coverage ratio             2.5          
Debt instrument covenant senior secured debt leverage ratio maximum             2.75          
Sliding scale minimum liquidity covenant             $ 100,000,000     $ 100,000,000    
Line of Credit | Revolving Credit Facility | 2017 Credit Agreement | Forecast                        
Debt Instrument [Line Items]                        
Increase (decrease) in interest rate               0.025%        
Debt instrument covenant senior secured debt leverage ratio maximum       2.75 3.25 3.75            
Sliding scale minimum liquidity covenant                 $ 150,000,000      
Line of Credit | Letter of Credit | Additional Credit Agreement 2017                        
Debt Instrument [Line Items]                        
Letters of credit maximum available under additional facilities                       $ 300,000,000
Line of Credit | LIBOR | Secured Debt | Original Term Loan                        
Debt Instrument [Line Items]                        
Basis spread on variable rate   2.00%                    
Floor interest rate   0.75%                    
Line of Credit | LIBOR | Secured Debt | 2019 Term Loan                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 2.75%                      
Floor interest rate 0.75%