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CREDIT FACILITY AND ACQUISITION DEBT (Narrative) (Details)
 3 Months Ended 12 Months Ended
Nov. 30, 2016
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
letter_of_credit
Dec. 31, 2020
Debt Covenant To Actual Ratios [Line Items]          
Letters of Credit | letter_of_credit       1  
Repayments of Long-term Lines of Credit   $ 33,000,000 $ 16,200,000    
Revolving credit facility present accordion provisions   75,000,000      
Deferred payments $ 2,000,000        
Amortization of Debt Issuance Costs   $ 200,000 94,000    
Ratio Actual [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)   5.75      
Term Loan [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Revolving credit facility, maximum borrowing capacity   $ 190,000,000      
Letter of Credit [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Revolving credit facility, maximum borrowing capacity   15.0      
Swingline [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Revolving credit facility, maximum borrowing capacity   10.0      
Senior Notes [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Amortization of Debt Issuance Costs   67,000 34,000    
Interest Expense, Debt   6,600,000 $ 5,400,000    
Debt Instrument, Term     74 months    
Credit Agreement [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Interest Expense, Debt   $ 1,200,000 $ 400,000    
Credit Agreement [Member] | Term Loan [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   2.125%      
Prime Rate Option [Member] | Line of Credit [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   1.50%      
Libor Margin Option [Member] | Line of Credit [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   2.50%      
Series of Individually Immaterial Business Acquisitions [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Interest Expense, Debt   $ 100,000 $ 200,000    
Revolving Credit Facility, Secured, Floating Rate [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Weighted average interest rate   4.30% 4.10%    
Revolving Credit Facility, Secured, Floating Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Carrying value of the liability component   $ 114,000,000      
Revolving Credit Facility, Secured, Floating Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Ratio Actual [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)   2.00      
Ratio of earnings to fixed cost obligations (in Ratio)   1.20      
Revolving Credit Facility [Member] | Credit Agreement 2018 [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Carrying value of the liability component       $ 83,800,000  
Amortization of Debt Issuance Costs   $ 100,000      
Forecast | Ratio Actual [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)         5.50
Minimum [Member] | Deferred Purchase Price Notes [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Debt Instrument, Imputed Interest Rate   7.30%      
Debt Instrument, Term       5 years  
Maximum [Member] | Deferred Purchase Price Notes [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Debt Instrument, Imputed Interest Rate   10.00%      
Debt Instrument, Term       20 years