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EQUITY-BASED COMPENSATION PLANS (NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Equity-based compensation expense | $ 3,300 | $ 3,100 | $ 7,399 | $ 5,976 |  |
Minimum |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Share-based Compensation Award Vesting Period |  |  | 4 years |  |  |
Maximum |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Share-based Compensation Award Vesting Period |  |  | 5 years |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Equity-based compensation expense |  |  | $ 2,600 | $ 5,900 |  |
Unrecognized Compensation Expense | 27,200 |  | $ 27,200 |  |  |
Non-option Equity Awards Granted |  |  | 11,656 | 130,885 |  |
Performance Shares [Member] |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Equity-based compensation expense | 300 | 350 | $ 500 | $ 700 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Description |  |  | During 2020, the Company awarded PRSUs that are subject to service and performance vesting conditions. If defined minimum targets are met, the annual value of the PRSUs issued will be between $0.2 million and $2.0 million and vest immediately. If the defined minimum targets are not met, then no shares will be issued. The number of shares awarded are based on the Company’s annual revenue and adjusted operating income for the fiscal years 2021 and 2022. Each fiscal year’s revenue and adjusted operating income will determine the award amount. The Company recognized compensation expense related to PRSUs of $0.5 million and $1.0 million, respectively, for the three and six months ended June 30, 2021. |  |  | During 2019, the Company awarded performance restricted stock units (“PRSUs”) that are subject to service and performance vesting conditions. If defined minimum targets are met, the annual value of the PRSUs issued will be between $0.4 million and $1.4 million and vest immediately. If the defined minimum targets are not met, then no shares will be issued. The award amounts are based on the Company’s annual adjusted operating income for the fiscal years 2019, 2020 and 2021. Each fiscal year’s adjusted operating income will determine the award amount.
Performance Shares [Member] | 2020 PRSUs [Member] |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Equity-based compensation expense | 500 |  | $ 1,000 |  |  |
Performance Shares [Member] | Minimum | 2019 PRSUs [Member] |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Equity-based compensation expense |  |  |  |  |  | $ 400
Performance Shares [Member] | Minimum | 2020 PRSUs [Member] |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Equity-based compensation expense |  |  |  |  | $ 200 |
Performance Shares [Member] | Maximum | 2019 PRSUs [Member] |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Equity-based compensation expense |  |  |  |  |  | $ 1,400
Performance Shares [Member] | Maximum | 2020 PRSUs [Member] |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Equity-based compensation expense |  |  |  |  | $ 2,000 |
Cost of Services |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Equity-based compensation expense | 1,100 | 1,100 | 2,500 | 2,000 |  |
Selling General And Administrative Expenses |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Equity-based compensation expense | $ 2,200 | $ 2,000 | $ 4,900 | $ 4,000 |  |

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