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FINANCING ARRANGEMENTS - Revolving Credit Agreement (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 17, 2020
Jul. 30, 2020
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Jul. 31, 2020
May 30, 2019
2019 Credit Agreement | Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity             $ 400,000,000
2021 Second Amended Credit Agreement              
Debt Instrument [Line Items]              
Unused commitment fee percentage   0.40%          
Debt collateral, percentage of capital stock, domestic subsidiaries       100.00%      
Debt collateral, percentage of capital stock, foreign subsidiaries       65.00%      
Amount of borrowings       $ 100,000,000 $ 200,000,000    
Outstanding letters of credit       25,800,000 $ 20,600,000    
2021 Second Amended Credit Agreement | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.50%            
Commitment fee percentage, daily amount of unused commitments 0.25%            
2021 Second Amended Credit Agreement | Maximum              
Debt Instrument [Line Items]              
Commitment fee percentage, daily amount of unused commitments 0.35%            
2021 Second Amended Credit Agreement | Canadian Prime Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate   1.50%          
2021 Second Amended Credit Agreement | Fixed Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate   2.50%          
2021 Second Amended Credit Agreement | LIBOR | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate 2.00%            
2021 Second Amended Credit Agreement | Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity           $ 225,000,000  
Debt issuance costs       3,500,000      
Minimum liquidity as a percentage of accrued merchant and supplier payables required under debt agreement     70.00%        
Monthly liquidity required as a percentage of accrued merchant and supplier payables required under debt agreement     100.00%        
Monthly liquidity required in addition to minimum     $ 50,000,000        
Minimum liquidity required under debt agreement     $ 250,000,000        
2021 Second Amended Credit Agreement | Letter of Credit              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity       $ 75,000,000