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DERIVATIVES - Fair Values of Derivative Financial Instruments Included in Consolidated Balance Sheets (Details) - Fair Value, Observable inputs, Level 2 - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivatives designated as hedging instruments | Interest rate swaps | Accrued expenses    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liability $ 409 $ 504
Derivatives designated as hedging instruments | Interest rate swaps | Other Long-Term Liabilities    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liability 410 1,034
Derivatives designated as hedging instruments | Foreign exchange contracts | Prepaid expenses and other current assets    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 582 0
Derivatives designated as hedging instruments | Foreign exchange contracts | Other assets    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 86 0
Derivatives not designated as hedging instruments | Interest rate swaps | Other Long-Term Liabilities    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liability $ 1,077 $ 1,742