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CREDIT FACILITY AND ACQUISITION DEBT (Narrative) (Details) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2016 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |
Repayments of Long-term Lines of Credit |  |  |  | $ 70,000,000 | $ 25,800,000 |  |
Revolving credit facility present accordion provisions |  | $ 75,000,000.0 |  | 75,000,000.0 |  |  |
Deferred payments | $ 2,000,000.0 |  |  |  |  |  |
Convertible Notes amortization of debt issuance costs |  |  |  | $ 393,000 | 189,000 |  |
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 |  | 15.0 |  | 15.0 |  |  |
Swingline [Member] |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  | 10.0 |  | 10.0 |  |  |
Senior Notes [Member] |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |
Convertible Notes amortization of debt issuance costs |  | 69,000 | $ 34,000 | 136,000 | 68,000 |  |
Senior Notes interest expense |  | 6,625,000 | $ 5,383,000 | 13,250,000 | 10,766,000 |  |
Debt Instrument, Term |  |  | 71 months |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |
Senior Notes interest expense |  | 1,106,000 | $ 362,000 | $ 2,336,000 | 740,000 |  |
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 |  |  |  | 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] |  |  |  |  |  |  |
Senior Notes interest expense |  | $ 124,000 | $ 161,000 | $ 251,000 | $ 329,000 |  |
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 |  | 3.60% | 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 |  | $ 89,700,000 |  | $ 89,700,000 |  |  |
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 |
Convertible Notes amortization of debt issuance costs |  | $ 118,000 | $ 54,000 | $ 245,000 | $ 108,000 |  |
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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