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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets $ 2,654 $ 2,614
Total liabilities 7,760 1,377
Contingent Consideration [Member] | Other Current Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities 2,009  
Contingent Consideration [Member] | Other Long-Term Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities 2,940 1,377
Interest Rate Swap [Member] | Other Long-Term Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities 2,811  
Certificates of Deposit [Member] | Marketable Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2,654 2,614
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2,654 2,614
Total liabilities 2,811  
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Other Long-Term Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities 2,811  
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] | Marketable Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 2,654 2,614
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities 4,949 1,377
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration [Member] | Other Current Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities 2,009  
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration [Member] | Other Long-Term Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities $ 2,940 $ 1,377