EQUITY-BASED COMPENSATION PLANS (NARRATIVE) (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2022

Mar. 31, 2021

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Equity-based compensation expense

$ 3,739

$ 4,028

2021 PRSUs [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Description

During 2021, 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 $1.2 million and $4.9 million and vest immediately in 2024. If the defined minimum targets are not met, then no shares will be issued. The number of shares that will be awarded will be based on the Company’s annual revenue and adjusted operating income for the fiscal year 2023. Fiscal year’s 2023 revenue and adjusted operating income will determine the award amount. Expense for these awards will begin at the start of the requisite service period, beginning January 1, 2023.

Minimum

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based Compensation Award Vesting Period

4 years

Minimum | 2021 PRSUs [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Equity-based compensation expense

$ 1,200

Maximum

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based Compensation Award Vesting Period

5 years

Maximum | 2021 PRSUs [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Equity-based compensation expense

$ 4,900

Restricted Stock Units (RSUs) [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Equity-based compensation expense

$ 3,600

$ 3,300

Unrecognized Compensation Expense

$ 35,300

Non-option Equity Awards Granted

20,643

44,471

Performance Shares [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Equity-based compensation expense

$ 0

$ 300

Performance Shares [Member] | 2019 PRSUs [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Description

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

$ 400

500

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 $0.4 million and $0.5 million, respectively, for the three months ended March 31, 2022 and 2021.

Performance Shares [Member] | 2022 PRSUs [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Description

For the ordinary course annual PRSUs, if defined minimum targets are met, the annual value of the PRSUs issued will be between $0.9 million and $3.5 million and vest immediately in March 2025. If the defined minimum targets are not met, then no shares will be issued. The number of shares that will be awarded will be based on the Company’s annual revenue and adjusted EBITDA for the fiscal year 2024. Fiscal year’s 2024 revenue and adjusted EBITDA will determine the award amount.

Performance Shares [Member] | 2022 VCP PRSUs [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Description

The one-time stretch financial goals PRSUs, if defined minimum targets at TTEC Engage and TTEC Digital business segments’ levels, are met, the value of the PRSUs issued will be between 0.0 million shares and 0.5 million shares and will vest immediately in March 2026. If the defined minimum targets are not met, then no shares will be issued. The number of shares to be awarded will be based on the TTEC Engage and TTEC Digital business segments’ annual revenue and adjusted EBITDA for the fiscal year 2025.

Performance Shares [Member] | Minimum | 2019 PRSUs [Member]