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CREDIT FACILITY AND ACQUISITION DEBT (Narrative) (Details) |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2020 USD ($) | Nov. 30, 2016 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2020 | Sep. 09, 2020 USD ($) | Dec. 31, 2019 USD ($) letter_of_credit | Mar. 19, 2014
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of Credit | letter_of_credit |  |  |  |  |  |  |  |  |  | 1 |
Repayments of Long-term Lines of Credit |  |  |  |  |  | $ 117,100,000 | $ 37,300,000 |  |  |  |
Revolving credit facility present accordion provisions |  |  | $ 75,000,000.0 |  |  | 75,000,000.0 |  |  |  |  |
Deferred payments | $ 2,100,000 | $ 2,000,000.0 |  |  |  |  |  |  |  |  |
Credit Facility amortization of debt issuance costs |  |  |  |  |  | $ 592,000 | 289,000 |  |  |  |
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 |  |  | 5.75 |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | $ 190,000,000.0 |  |  | $ 190,000,000.0 |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | 15,000,000.0 |  |  | 15,000,000.0 |  |  |  |  |
Swingline [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | 10,000,000.0 |  |  | 10,000,000.0 |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit Facility amortization of debt issuance costs |  |  | 72,000 |  | $ 35,000 | 208,000 | 103,000 |  |  |  |
Acquisition debt imputed interest expense |  |  | 6,625,000 |  | $ 5,383,000 | 19,875,000 | 16,148,000 |  |  |  |
Debt Instrument, Term |  |  |  |  | 68 months |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition debt imputed interest expense |  |  | 828,000 |  | $ 350,000 | $ 3,164,000 | 1,090,000 |  |  |  |
Credit Agreement [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 3.125% |  |  |  |  |
Convertible Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value of the liability component |  |  | 2,522,000 |  |  | $ 2,522,000 |  |  | $ 2,559,000 | $ 5,971,000 |
Credit Facility amortization of debt issuance costs |  |  | $ 9,000 |  | 6,000 | $ 21,000 | 19,000 |  |  |  |
Stated interest rate percentage |  |  | 2.75% |  |  | 2.75% |  |  |  |  | 2.75%
Acquisition debt imputed interest expense |  |  | $ 43,000 |  | 43,000 | $ 130,000 | 131,000 |  |  |  |
Prime Rate Option [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 2.00% |  |  |  |  |
Libor Margin Option [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 3.00% |  |  |  |  |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition debt imputed interest expense |  |  | 122,000 |  | $ 152,000 | $ 373,000 | $ 481,000 |  |  |  |
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 |  |  |  |  | 3.90% | 3.90% | 4.00% |  |  |  |
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 |  |  | $ 56,000,000 |  |  | $ 56,000,000 |  |  |  |  |
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 |  |  | 2.00 |  |  |  |  |
Ratio of earnings to fixed cost obligations (in Ratio) |  |  | 1.20 |  |  | 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 |
Credit Facility amortization of debt issuance costs |  |  |  | $ 118,000 | $ 59,000 | $ 363,000 | $ 167,000 |  |  |  |
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% |  |  | 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% |  |  | 10.00% |  |  |  |  |
Debt Instrument, Term |  |  |  | 20 years |  |  |  |  |  |  |

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