TTEC (TTEC) 10-Q 4 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-11919
Entity Registrant Name	TTEC Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-1291044
Entity Address, Address Line One	9197 South Peoria Street
Entity Address, City or Town	Englewood
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80112
City Area Code	303
Local Phone Number	397-8100
Title of 12(b) Security	Common stock of TTEC Holdings, Inc., $0.01 par value per share
Trading Symbol	TTEC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		46,822,731
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001013880
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 144,213	$ 132,914
Accounts receivable, net of allowance of $4,997 and $5,067, respectively	350,307	378,397
Prepaids and other current assets	125,849	104,597
Income and other tax receivables	43,489	40,894
Total current assets	663,858	656,802
Long-term assets
Property, plant and equipment, net	168,697	178,706
Operating lease assets	112,129	120,820
Goodwill	362,862	363,502
Deferred tax assets, net	15,534	15,081
Other intangible assets, net	107,525	112,059
Other long-term assets	65,048	69,438
Total long-term assets	831,795	859,606
Total assets	1,495,653	1,516,408
Current liabilities
Accounts payable	49,343	66,658
Accrued employee compensation and benefits	161,792	163,658
Other accrued expenses	72,004	55,915
Income taxes payable	36,503	19,709
Deferred revenue	34,220	39,956
Current operating lease liabilities	43,043	43,651
Other current liabilities	6,041	6,623
Total current liabilities	402,946	396,170
Long-term liabilities
Line of credit	339,000	385,000
Deferred tax liabilities, net	6,400	7,747
Non-current Income Taxes Payable	22,271	22,291
Non-current operating lease liabilities	89,967	98,277
Other long-term liabilities	100,154	96,185
Total long-term liabilities	557,792	609,500
Total liabilities	960,738	1,005,670
Redeemable noncontrolling interest	54,674	52,976
Stockholders' equity
Preferred stock - $0.01 par value: 10,000,000 shares authorized; zero shares outstanding as of March 31, 2021 and December 31, 2020	0	0
Common stock - $0.01 par value; 150,000,000 shares authorized; 46,819,468 and 46,737,033 shares outstanding as of March 31, 2021 and December 31, 2020, respectively	468	467
Additional paid-in capital	359,030	360,293
Treasury stock at cost: 35,232,785 and 35,315,220 shares as of March 31, 2021 and December 31, 2020, respectively	(599,851)	(601,214)
Accumulated other comprehensive income (loss)	(80,713)	(72,156)
Retained earnings	787,598	757,312
Noncontrolling interest	13,709	13,060
Total stockholders' equity	480,241	457,762
Total liabilities and stockholders' equity	$ 1,495,653	$ 1,516,408

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Stockholders' equity
Accounts Receivable, Allowance for Credit Loss, Current	$ 4,997,000	$ 5,067,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares outstanding	46,819,468	46,737,033
Treasury stock, shares	35,232,785	35,315,220

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Consolidated Statements of Comprehensive Income
Revenue.	$ 539,219	$ 432,213
Type of Revenue	us-gaap:ServiceMember	us-gaap:ServiceMember
Operating expenses
Cost of services (exclusive of depreciation and amortization presented separately below)	$ 388,660	$ 321,557
Selling, general and administrative	52,757	49,834
Depreciation and amortization	20,459	18,872
Restructuring charges, net	402	538
Impairment losses	3,517	696
Total operating expenses	465,795	391,497
Income from operations	73,424	40,716
Other income (expense)
Interest income	179	364
Interest expense	(1,802)	(9,592)
Other income (expense), net	(798)	3,396
Total other income (expense)	(2,421)	(5,832)
Income before income taxes	71,003	34,884
Benefit from (provision for) income taxes	(15,979)	(10,199)
Net income	55,024	24,685
Net income attributable to noncontrolling interest	(4,606)	(3,151)
Net income (loss) attributable to TTEC stockholders	50,418	21,534
Other comprehensive income (loss)
Foreign currency translation adjustments	(5,753)	(29,814)
Derivative valuation, gross	(3,665)	(10,549)
Derivative valuation, tax effect	951	2,746
Other, net of tax	36	127
Total other comprehensive income (loss)	(8,431)	(37,490)
Total comprehensive income (loss)	46,593	(12,805)
Less: Comprehensive income attributable to noncontrolling interest	(3,034)	(1,700)
Comprehensive income (loss) attributable to TTEC stockholders	$ 43,559	$ (14,505)
Weighted average shares outstanding
Basic	46,743	46,498
Diluted	47,355	46,813
Weighted Average Share Counts
Basic	$ 1.08	$ 0.46
Diluted	1.06	0.46
Common Stock, Dividends, Per Share, Declared	$ 0.43	$ 0.34

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity and Mezzanine Equity - USD ($) $ in Thousands	Stockholders' Equity of the Company Common Stock [Member]	Stockholders' Equity of the Company Treasury Stock [Member]	Stockholders' Equity of the Company Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss)	Stockholders' Equity of the Company Retained Earnings [Member]	Noncontrolling Interest [Member]	Total
Common stock beginning balance, share at Dec. 31, 2019	46,489,000
Beginning balance, value at Dec. 31, 2019	$ 465	$ (605,314)	$ 356,409	$ (106,234)	$ 773,218	$ 13,186	$ 431,730
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)					21,534	2,216	23,750
Dividends to shareholders					(15,843)		(15,843)
Dividends distributed to noncontrolling interest						(1,850)	(1,850)
Foreign currency translation adjustments				(29,298)		(516)	(29,814)
Derivatives valuation, net of tax				(7,803)			(7,803)
Vesting of restricted stock units, share	108,000
Vesting of restricted stock units, value	$ 1	1,783	(3,594)				(1,810)
Equity-based compensation expense			2,919				2,919
Other, net of tax.				127			127
Common stock ending balance, share at Mar. 31, 2020	46,597,000
Ending balance, value at Mar. 31, 2020	$ 466	(603,531)	355,734	(143,208)	778,909	13,036	401,406
Temporary Equity, Beginning Balance at Dec. 31, 2019							48,923
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity, Net Income							935
Acquisition of noncontrolling interest							3,750
Temporary equity distributions.							(241)
Temporary Equity, Ending Balance at Mar. 31, 2020							$ 53,367
Preferred stock beginning balance, share at Dec. 31, 2020							0
Common stock beginning balance, share at Dec. 31, 2020	46,737,000						46,737,033
Beginning balance, value at Dec. 31, 2020	$ 467	(601,214)	360,293	(72,156)	757,312	13,060	$ 457,762
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)					50,418	2,908	53,326
Dividends to shareholders					(20,132)		(20,132)
Dividends distributed to noncontrolling interest						(2,385)	(2,385)
Foreign currency translation adjustments				(5,879)		126	(5,753)
Derivatives valuation, net of tax				(2,714)			(2,714)
Vesting of restricted stock units, share	82,000
Vesting of restricted stock units, value	$ 1	1,363	(5,291)				(3,927)
Equity-based compensation expense			4,028				4,028
Other, net of tax.				36			$ 36
Preferred stock ending balance, share at Mar. 31, 2021							0
Common stock ending balance, share at Mar. 31, 2021	46,819,000						46,819,468
Ending balance, value at Mar. 31, 2021	$ 468	$ (599,851)	$ 359,030	$ (80,713)	$ 787,598	$ 13,709	$ 480,241
Temporary Equity, Beginning Balance at Dec. 31, 2020							52,976
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity, Net Income							1,698
Temporary Equity, Ending Balance at Mar. 31, 2021							$ 54,674

Consolidated Statement of Sto_2

Consolidated Statement of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Consolidated statement of stockholders' equity and mezzanine equity [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.43	$ 0.34

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income	$ 55,024	$ 24,685
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,459	18,872
Amortization of contract acquisition costs	176	130
Amortization of debt issuance costs	175	183
Imputed interest expense and fair value adjustments to contingent consideration	877	3,220
Provision for credit losses	21	162
(Gain) loss on disposal of assets	46	14
Impairment losses	3,517	696
Deferred income taxes	(1,090)	4,589
Excess tax benefit from equity-based awards	(1,775)	(195)
Equity-based compensation expense	4,028	2,919
(Gain) loss on foreign currency derivatives	61	485
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	27,053	11,611
Prepaids and other assets	(22,669)	19,219
Accounts payable and accrued expenses	15,972	(933)
Deferred revenue and other liabilities	(32,088)	(23,492)
Net cash provided by operating activities	69,787	62,165
Cash flows from investing activities
Proceeds from sale of long-live assets	25	15
Purchases of property, plant and equipment	(11,565)	(16,813)
Acquisitions, net of cash acquired of zero and $3,123, respectively	(267)	(5,243)
Net cash used in investing activities	(11,807)	(22,041)
Cash flows from financing activities
Net proceeds (borrowings) from line of credit	(46,000)	410,000
Payments on other debt	(1,871)	(2,400)
Payments to noncontrolling interest	(2,385)	(2,091)
Tax payments related to issuance of restricted stock units	(3,927)	(1,810)
Payments of debt issuance costs		(35)
Net cash (used in) provided by financing activities	(54,183)	403,664
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2,576)	(7,374)
Increase (decrease) in cash, cash equivalents and restricted cash	1,221	436,414
Cash, cash equivalents and restricted cash, beginning of period	159,015	105,591
Cash, cash equivalents and restricted cash, end of period	160,236	542,005
Supplemental disclosures
Cash paid for interest	1,576	2,864
Cash paid for income taxes	4,275	3,248
Non-cash investing and financing activities
Acquisition of long lived assets through finance leases	137	837
Acquisition of equipment through increase in accounts payable, net	(3,431)	(3,511)
Dividends declared but not paid	$ 20,132	$ 15,843

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from investing activities
Acquisitions, net of cash acquired of zero and $3,123, respectively	$ 0	$ 3,123,000

OVERVIEW AND BASIS OF PRESENTAT

OVERVIEW AND BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 2021
OVERVIEW AND BASIS OF PRESENTATION [Abstract]
OVERVIEW AND BASIS OF PRESENTATION	(1) OVERVIEW AND BASIS OF PRESENTATION Summary of Business TTEC Holdings, Inc. (“TTEC”, “the Company”) is a leading global customer experience as a service (“CXaaS”) partner for many of the world’s iconic brands, Fortune 1000 companies, government agencies, and disruptive growth companies. TTEC helps its clients deliver frictionless customer experiences, strengthen customer relationships, brand recognition and loyalty through personalized interactions, improve their Net Promoter Score, customer satisfaction and quality assurance, and lower their total cost to serve by combining innovative digital solutions with best-in-class service capabilities to enable and deliver simplified, consistent and seamless customer experience across channels and phases of the customer lifecycle. TTEC’s 58,500 employees serve clients in the automotive, communication, financial services, national/federal and state and local governments, healthcare, logistics, media and entertainment, e-tail/retail, technology, travel and transportation industries via operations in the United States, Australia, Belgium, Brazil, Bulgaria, Canada, Costa Rica, Germany, Greece, India, Ireland, Mexico, the Netherlands, New Zealand, the Philippines, Poland, Singapore, South Africa, Thailand, and the United Kingdom. The Company reports its financial information based on two segments: TTEC Digital and TTEC Engage. ● TTEC Digital provides the CX technology services and platforms to support the Company’s clients’ customer interaction delivery infrastructure. The segment designs, builds and operates the omnichannel ecosystem in a cloud, on premise, or hybrid environment, and fully integrates, orchestrates, and administers highly scalable, feature-rich CX technology applications. ● TTEC Engage provides the CX managed services to support the Company’s clients’ end-to-end customer interaction delivery, by providing the essential CX omnichannel and application technologies, human resources, recruiting, training and production, at-home or facility-based delivery infrastructure on a global scale, and engagement processes. This segment provides full-service digital, omnichannel customer engagement, supporting customer care, customer acquisition, growth and retention, and fraud detection and prevention services. TTEC Digital and TTEC Engage strategically come together under the Company’s unified offering, Humanify ® ® Basis of Presentation The Consolidated Financial Statements are comprised of the accounts of TTEC, its wholly owned subsidiaries, its 55% equity owned subsidiary Percepta, LLC, its 70% equity owned subsidiary First Call Resolution, LLC and its 70% equity owned subsidiary Serendebyte, Inc. (see Note 2). All intercompany balances and transactions have been eliminated in consolidation. The unaudited Consolidated Financial Statements do not include all of the disclosures required by accounting principles generally accepted in the U.S. (“GAAP”), pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). The unaudited Consolidated Financial Statements reflect all adjustments which, in the opinion of management, are necessary to state fairly the consolidated financial position of the Company and the consolidated results of operations and comprehensive income (loss) and the consolidated cash flows of the Company. All such adjustments are of a normal, recurring nature. Operating results for the periods presented are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. These unaudited Consolidated Financial Statements should be read in conjunction with the Company’s audited Consolidated Financial Statements and footnotes thereto included in the Company’s Annual Report on Form 10-K Use of Estimates The preparation of the Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions in determining the reported amounts of assets and liabilities, disclosure of contingent liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenue and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates including those related to derivatives and hedging activities, income taxes including the valuation allowance for deferred tax assets, litigation reserves, restructuring reserves, allowance for credit losses, contingent consideration, redeemable noncontrolling interest, and valuation of goodwill, long-lived and intangible assets. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ materially from these estimates under different assumptions or conditions. Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents consist of cash, primarily held in interest-bearing investments, and liquid short-term investments which have original maturities of less than 90 days. Restricted cash includes cash whereby the Company’s ability to use the funds at any time is contractually limited or is generally designated for specific purposes arising out of certain contractual or other obligations. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in the Condensed Consolidated Balance Sheets that sum to the amounts reported in the Condensed Consolidated Statement of Cash Flows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ ​ $ 144,213 $ 132,914 ​ Restricted cash included in "Prepaid and other current assets" ​ ​ 16,023 ​ 26,101 ​ Restricted cash included in "Other noncurrent assets" ​ ​ — ​ — ​ Total ​ ​ $ 160,236 $ 159,015 ​ ​ Concentration of Credit Risk The Company is exposed to credit risk in the normal course of business, primarily related to accounts receivable and derivative instruments. Historically, the losses related to credit risk have been immaterial. The Company regularly monitors its credit risk to mitigate the possibility of current and future exposures resulting in a loss. The Company evaluates the creditworthiness of its clients prior to entering into an agreement to provide services and as necessary through the life of the client relationship. The Company does not believe it is exposed to more than a nominal amount of credit risk in its derivative hedging activities, as the Company diversifies its activities across eight investment-grade financial institutions. Recently Adopted Accounting Pronouncements In December 2019, the FASB issued ASU 2019-12, “Simplifying the Accounting for Income Taxes” (ASU 740), which is intended to simplify various aspects related to income tax accounting. The ASU is effective for interim and annual periods beginning on or after December 15, 2020, with early adoption permitted. The Company adopted the new guidance effective January 1, 2021 and the adoption had no effect on the financial statements or related disclosures during the quarter. Other Accounting Pronouncements In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform” (Topic 848), which provides optional expedients and exceptions for contracts, hedging relationships, and other transactions affected by reference rate reform due to the anticipated cessation of LIBOR on or before December 31, 2021. The ASU is effective from March 12, 2020, through December 31, 2022 and could impact the accounting for LIBOR provisions in the Company’s credit facility agreement. In addition, in January 2021, the FASB issued ASU 2021-01, “Reference Rate Reform – Scope,” which clarified the scope of ASC 848 relating to contract modifications. The Company has not yet adopted the standard but does not expect that the adoption of this guidance will have a material impact on the Company’s financial position, results of operations or cash flows.

ACQUISITIONS

ACQUISITIONS	3 Months Ended
	Mar. 31, 2021
ACQUISITIONS [ABSTRACT]
ACQUISITIONS	(2) ACQUISITIONS AND DIVESTITURES Voice Foundry On August 5, 2020, TTEC Digital, LLC, a subsidiary of the Company, closed the first phase of the acquisition of the Voice Foundry business by acquiring 100% of the business’s net assets in the U.S. and U.K., (the “VF US Transaction”). Voice Foundry is a preferred Amazon Connect cloud contact center service and implementation partner with approximately 60 employees in the U.S. and U.K. The business has been integrated into the TTEC Digital segment and is being fully consolidated into the financial statements of TTEC. Total cash paid at acquisition was $34.3 million. The VF US Transaction is subject to customary representations and warranties, holdbacks, and working capital adjustments. The VF US Transaction includes two contingent payments over the next two years with each payment having a maximum value of $7.4 million based on VF US’s EBITDA performance for 2020 and 2021. The Company finalized the net working capital adjustment for $0.3 million which was paid to Voice Foundry during the first quarter of 2021. The fair value of the contingent consideration has been estimated using a Monte Carlo model. The model was based on current expected EBITDA performance, a discount rate of 23.1%, a volatility rate of 47%, and an adjusted risk-free rate of 2.6%. Based on the model, a $10.9 million expected future payment was calculated and recorded as of the acquisition date. During the fourth quarter of 2020 and the first quarter of 2021, a $3.2 million expense and a $0.5 million expense, respectively, were recorded related to fair value adjustments of the estimated contingent consideration based on revised estimates of EBITDA performance for 2021. These expenses were included in Other income (expense) in the Consolidated Statements of Comprehensive Income (Loss). During the first quarter of 2021, the contingent payment related to 2020 was finalized at a value of $7.4 million and was paid in April 2021. As of March 31, 2021, the value of the accrual is $14.6 million, with $7.4 million included in Other accrued expenses and $7.2 million included in Other long-term liabilities in the accompanying Consolidated Balance Sheets. A multi-period excess earnings method under the income approach was used to estimate the fair value of the customer relationships intangible asset. The significant assumption utilized in calculating the fair value of the customer relationships intangible asset was the customer attrition rate. The following summarizes the fair values of the identifiable assets acquired and liabilities assumed as of the acquisition date (in thousands): ​ ​ ​ ​ ​ ​ ​ Acquisition Date ​ ​ Fair Value Accounts receivable, net ​ $ 3,758 ​ Prepaid and other expenses ​ 345 ​ Tradename ​ 400 ​ Non-compete ​ 150 ​ Customer relationships ​ 6,550 ​ Goodwill ​ ​ 35,881 ​ ​ ​ $ 47,084 ​ ​ ​ ​ ​ ​ Accounts payable ​ $ 289 ​ Accrued employee compensation ​ 741 ​ Deferred revenue ​ 170 ​ ​ ​ $ 1,200 ​ ​ ​ ​ ​ ​ Total purchase price ​ $ 45,884 ​ ​ In the first quarter of 2021, the Company finalized the valuation of VF US for the acquisition date assets acquired and liabilities assumed and determined that no material adjustments to any of the balances were required. The VF US customer relationships and tradename are being amortized over useful lives of 4 and 2 years, respectively. The goodwill recognized from the VF US acquisition is attributable, but not limited to, the acquired workforce and expected synergies with the TTEC Digital segment. The tax basis of the acquired intangibles and goodwill will be deductible for income tax purposes. The acquired goodwill and intangibles and operating results of VF US are reported within the TTEC Digital segment from the date of acquisition. Voice Foundry ASEAN On November 4, 2020, TTEC Europe BV, a subsidiary of the Company, closed the final phase of the acquisition of the Voice Foundry business by acquiring 100% of the issued stock of Saasy Ventures Pty Ltd. (“VF ASEAN”). The business has been integrated into the TTEC Digital segment and is being fully consolidated into the financial statements of TTEC. Total cash paid at acquisition was $15.2 million. The VF ASEAN Transaction is subject to customary representations and warranties, holdbacks, and working capital adjustments. The VF ASEAN Transaction includes two contingent payments over the next two years with each payment having a maximum value of $2.2 million based on VF ASEAN’s EBITDA performance for 2020 and 2021. The fair value of the contingent consideration has been estimated using a Monte Carlo model. The model was based on current expected EBITDA performance, a discount rate of 18.4%, a volatility rate of 50%, and an adjusted risk-free rate of 1.6%. Based on the model, a $2.8 million expected future payment was calculated and recorded as of the acquisition date. During the fourth quarter of 2020 and the first quarter of 2021, a $1.2 million expense and a $0.4 million expense, respectively, were recorded related to fair value adjustments of the estimated contingent consideration based on estimates of EBITDA performance for 2020 and 2021. These expenses were included in Other income (expense) in the Consolidated Statements of Comprehensive Income (Loss). During the first quarter of 2021, the contingent payment related to 2020 was finalized at a value of $2.2 million and was paid in April 2021. As of March 31, 2021, the value of the accrual is $4.3 million, with $2.2 million included in Other accrued expenses and $2.1 million included in Other long-term liabilities in the accompanying Consolidated Balance Sheets. A multi-period excess earnings method under the income approach was used to estimate the fair value of the customer relationships intangible asset. The significant assumption utilized in calculating the fair value of the customer relationships intangible asset was the customer attrition rate. The following summarizes the estimated fair values of the identifiable assets acquired and liabilities assumed as of the acquisition date (in thousands): ​ ​ ​ ​ ​ ​ Preliminary ​ ​ Estimate of ​ ​ Acquisition Date ​ ​ Fair Value Cash ​ $ 1,300 ​ Accounts receivable, net ​ ​ 937 ​ Prepaid and other expenses ​ 115 ​ Income tax receivable ​ ​ 30 ​ Property, plant and equipment ​ ​ 274 ​ Tradename ​ 300 ​ Customer relationships ​ 3,100 ​ Goodwill ​ ​ 14,418 ​ ​ ​ $ 20,474 ​ ​ ​ ​ ​ ​ Accounts payable ​ $ 960 ​ Accrued employee compensation ​ 113 ​ Deferred revenue ​ ​ 236 ​ Deferred tax liability ​ ​ 1,013 ​ Other accrued liabilities ​ (78) ​ ​ ​ $ 2,244 ​ ​ ​ ​ ​ ​ Total purchase price ​ $ 18,230 ​ ​ The estimates of fair value of identifiable assets acquired and liabilities assumed are preliminary, pending finalization of the valuation and tax returns, thus are subject to revisions that may result in adjustments to the values presented above. The VF ASEAN customer relationships and tradename have been estimated based on the initial valuation and will be amortized over estimated useful lives of 4 and 2 years, respectively. The goodwill recognized from the VF ASEAN acquisition is estimated to be attributable, but not limited to, the acquired workforce and expected synergies with the TTEC Digital segment. The tax basis of the acquired intangibles and goodwill will not be deductible for income tax purposes. The acquired goodwill and intangibles and operating results of VF ASEAN are reported within the TTEC Digital segment from the date of acquisition. Serendebyte On February 7, 2020, the Company acquired, through its subsidiary TTEC Digital, LLC, 70% of the outstanding shares of capital stock of Serendebyte Inc., a Delaware corporation (“the Serendebyte Transaction”). Serendebyte is an autonomous customer experience and intelligent automation solutions provider with 125 employees based in India, the United States, and Canada. The business has been integrated into the TTEC Digital segment and is being fully consolidated into the financial statements of TTEC. Total cash paid at acquisition, for 70% of the outstanding shares of capital stock, was $9.0 million. The Serendebyte Transaction is subject to customary representations and warranties, holdbacks, and a net working capital adjustment. The Company finalized the net working capital adjustment for $0.8 million during the second quarter of 2020 which was paid by Serendebyte to the Company in the second quarter of 2020. As of the closing of the Serendebyte Transaction, Serendebyte’s founder and certain members of its management continued to hold the remaining 30% interest in Serendebyte, Inc. (“Remaining Interest”). Between January 31, 2023 and December 31, 2023, Serendebyte’s founder and the management team shall have an option to sell to TTEC Digital, LLC and TTEC Digital, LLC shall have an option to purchase the Remaining Interest at a purchase price equal to a multiple of Serendebyte’s adjusted trailing twelve month EBITDA for this particular acquisition. The noncontrolling interest was recorded at fair value on the date of acquisition. The fair value was based on significant inputs not observable in the market (Level 3 inputs) including forecasted earnings, discount rate of 35%, working capital requirements and applicable tax rates. The noncontrolling interest was valued at $3.8 million and is shown as Redeemable noncontrolling interest in the accompanying Consolidated Balance Sheets. As a condition to closing, Serendebyte’s founder and certain members of the management team agreed to continue their affiliation with Serendebyte at least through 2023, and the founder agreed not to compete with TTEC for a period of four years after the disposition of the Remaining Interest. The following summarizes the fair values of the identifiable assets acquired and liabilities assumed as of the acquisition date (in thousands): ​ ​ ​ ​ ​ ​ ​ Acquisition Date ​ ​ Fair Value Cash ​ $ 3,123 ​ Accounts receivable, net ​ 1,243 ​ Prepaid and other assets ​ 1,327 ​ Property, plant and equipment ​ ​ 20 ​ Deferred tax assets ​ ​ 14 ​ Tradename ​ ​ 400 ​ Customer relationships ​ ​ 1,920 ​ Goodwill ​ ​ 9,033 ​ ​ ​ $ 17,080 ​ ​ ​ ​ ​ ​ Accounts payable ​ $ 120 ​ Accrued employee compensation and benefits ​ 1,025 ​ Accrued income taxes ​ 170 ​ Accrued expenses ​ ​ 2,208 ​ Deferred tax liabilities - long-term ​ 629 ​ ​ ​ $ 4,152 ​ ​ ​ ​ ​ ​ Total purchase price ​ $ 12,928 ​ ​ In the fourth quarter of 2020, the Company finalized the valuation of Serendebyte for the acquisition date assets acquired and liabilities assumed and determined no material adjustments to any of the balances were required. At the date of the purchase, an additional $2.2 million of cash was retained in the entity that was withdrawn by the holders of the Remaining Interest during the second quarter of 2020. The Serendebyte customer relationships and tradename are being amortized over useful lives of 5 and 3 years, respectively. The goodwill recognized from the Serendebyte acquisition is attributable, but not limited to, the acquired workforce and expected synergies with the TTEC Digital segment. The tax basis of the acquired intangibles and goodwill will not be deductible for income tax purposes. The acquired goodwill and intangibles and operating results of Serendebyte are reported within the TTEC Digital segment from the date of acquisition. Financial Impact of Acquired Businesses The acquired businesses purchased in 2020 noted above contributed revenues of $11.6 million and net income of $1.0 million, inclusive of $0.8 million of acquired intangible amortization, to the Company for the quarter ended March 31, 2021. The unaudited proforma financial results for the three months ended March 31, 2020 combines the consolidated results of the Company, Voice Foundry US, Voice Foundry ASEAN and Serendebyte assuming the acquisitions had been completed on January 1, 2020. The reported revenue and net income of $432.2 million and $21.5 million would have been $438.0 million and $23.0 million for the three months ended March 31, 2020, respectively, on an unaudited proforma basis. The unaudited proforma consolidated results are not to be considered indicative of the results if these acquisitions occurred in the periods mentioned above, or indicative of future operations or results. Additionally, the proforma consolidated results do not reflect any anticipated synergies expected as a result of the acquisition. Dissolutions In the ordinary course of business, the Company operates different legal entities around the globe that have functional currencies other than USD. From time to time, the Company liquidates some of the entities when they are no longer needed to operate its business, and also forms new entities to support the needs of the business. The liquidation proceedings may take different forms, take considerable amount of time, and may also result in losses or gains unrelated to operations. Subsequent Event On April 8, 2021, the Company acquired, through its subsidiary TTEC Digital, LLC, 100% of the outstanding stock of Avtex Solutions, Holdings LLC (“Avtex”). Avtex is an end-to-end customer experience and CXaaS solutions provider with offerings in Genesys and Microsoft cloud solutions. The business will be integrated into the TTEC Digital segment and will be fully consolidated into the financial statements of TTEC. Total cash paid at acquisition was $490.0 million, less customary amounts held in escrow for sellers’ indemnity obligations. The Avtex Transaction is subject to customary representations and warranties, holdbacks, and a net working capital adjustment. The Company used cash from operations and drew down on its Credit Facility to fund the acquisition.

SEGMENT INFORMATION

SEGMENT INFORMATION	3 Months Ended
	Mar. 31, 2021
SEGMENT INFORMATION [ABSTRACT]
SEGMENT INFORMATION	(3) SEGMENT INFORMATION The Company reports the following two segments: TTEC Digital ● Technology Services: the Company’s technology services design, integrate and operate highly scalable, digital omnichannel technology solutions in the cloud, on premise, or hybrid environment, including journey orchestration, automation and AI, knowledge management, and workforce productivity. ● Professional Services: the Company’s management consulting practices deliver customer experience strategy, analytics, process optimization, and learning and performance services. TTEC Engage ● Customer Acquisition Services: the Company’s customer growth and acquisition services optimize the buying journeys for acquiring new customers by leveraging technology and analytics to deliver personal experiences that increase the quantity and quality of leads and customers. ● Customer Care Services: the Company’s customer care services provide turnkey contact center solutions, including digital omnichannel technologies, associate recruiting and training, facilities, and operational expertise to create exceptional customer experiences across all touchpoints. ● Fraud Prevention Services: the Company’s digital fraud detection and prevention services proactively identify and prevent fraud and provide community content moderation and compliance. The Company allocates to each segment its portion of corporate operating expenses. All intercompany transactions between the reported segments for the periods presented have been eliminated. The following tables present certain financial data by segment (in thousands): Three Months Ended March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Depreciation Income ​ ​ Gross ​ Intersegment ​ Net ​ & ​ from ​ ​ Revenue ​ Sales ​ Revenue ​ Amortization ​ Operations TTEC Digital ​ $ 63,609 ​ $ (22) ​ $ 63,587 ​ $ 3,887 ​ $ 4,202 ​ TTEC Engage ​ 475,632 ​ — ​ 475,632 ​ 16,572 ​ 69,222 ​ Total ​ $ 539,241 ​ $ (22) ​ $ 539,219 ​ $ 20,459 ​ $ 73,424 ​ ​ Three Months Ended March 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Depreciation Income ​ ​ ​ Gross ​ Intersegment ​ Net ​ & ​ from ​ ​ ​ Revenue ​ Sales ​ Revenue ​ Amortization ​ Operations ​ TTEC Digital ​ $ 77,781 ​ $ (225) ​ $ 77,556 ​ $ 3,288 ​ $ 10,258 ​ TTEC Engage ​ 354,657 ​ ​ — ​ 354,657 ​ 15,584 ​ 30,458 ​ Total ​ $ 432,438 ​ $ (225) ​ $ 432,213 ​ $ 18,872 ​ $ 40,716 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ ​ March 31, ​ ​ ​ 2021 2020 Capital Expenditures ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ $ 1,532 $ 2,438 TTEC Engage ​ 10,033 ​ 14,375 ​ Total ​ $ 11,565 $ 16,813 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 December 31, 2020 ​ Total Assets ​ ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ ​ $ 268,063 $ 277,365 ​ TTEC Engage ​ ​ 1,227,590 ​ 1,239,043 ​ Total ​ ​ $ 1,495,653 $ 1,516,408 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 December 31, 2020 ​ Goodwill ​ ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ ​ $ 127,717 $ 128,211 ​ TTEC Engage ​ ​ 235,145 ​ 235,291 ​ Total ​ ​ $ 362,862 $ 363,502 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table presents revenue based upon the geographic location where the services are provided (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ ​ 2021 2020 ​ Revenue ​ ​ ​ ​ ​ ​ ​ ​ United States ​ $ 358,326 ​ $ 277,676 ​ Philippines ​ 102,252 ​ 91,105 ​ ​ Latin America ​ 29,439 ​ 25,098 ​ ​ Europe / Middle East / Africa ​ 25,917 ​ 16,944 ​ ​ Asia Pacific / India ​ 16,167 ​ 15,168 ​ ​ Canada ​ 7,118 ​ 6,222 ​ ​ Total ​ $ 539,219 $ 432,213 ​ ​ ​

SIGNIFICANT CLIENTS AND OTHER C

SIGNIFICANT CLIENTS AND OTHER CONCENTRATIONS	3 Months Ended
	Mar. 31, 2021
SIGNIFICANT CLIENTS AND OTHER CONCENTRATIONS [Abstract]
SIGNIFICANT CLIENTS AND OTHER CONCENTRATIONS	(4) SIGNIFICANT CLIENTS AND OTHER CONCENTRATIONS The Company had one client that contributed in excess of 10% of total revenue for the three months ended March 31, 2021; this client operates in the financial services industry and is included in the TTEC Engage segment. This client contributed 15.7% and 2.9% of total revenue for the three months ended March 31, 2021 and 2020, respectively. The Company had no To limit the Company’s credit risk with its clients, management performs periodic credit evaluations, maintains allowances for credit losses and may require pre-payment for services from certain clients. Based on currently available information, management does not believe significant credit risk existed as of March 31, 2021. In connection with the implementation of ASC 326 as of January 1, 2020, the Company analyzed the prior history of credit losses on revenue for TTEC as a whole and separately for each of the two segments. Based on this evaluation, no modification to the allowance for credit losses balance was necessary as of the implementation date. At the end of each quarter beginning with March 31, 2020, an allowance for credit losses will be calculated based on the current quarterly revenue multiplied by the historical loss percentage of the prior three year period and recorded in the income statement. In addition to the evaluation of historical losses, the Company considers current and future economic conditions and events such as changes in customer credit quality and liquidity. The Company will write-off accounts receivable against this allowance when the Company determines a balance is uncollectible. Activity in the Company’s Allowance for credit losses consists of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ 2021 2020 Balance, beginning of year ​ $ 5,067 ​ $ 5,452 ​ Provision for credit losses ​ 21 ​ 162 ​ Uncollectible receivables written-off ​ (83) ​ (208) ​ Effect of foreign currency ​ (8) ​ (4) ​ Balance, end of year ​ $ 4,997 ​ $ 5,402 ​ ​ On October 15, 2018, Sears Holding Corporation (“Sears”) announced that it had filed a petition for bankruptcy protection in the United States Bankruptcy Court for the Southern District of New York. As of March 31, 2021 and December 31, 2020, TTEC had approximately $2.7 million in pre-petition accounts receivables outstanding related to Sears; during the fourth quarter of 2018 a $2.7 million allowance for uncollectible accounts was recorded and included in Selling, general and administrative expenses in the Consolidated Statements of Comprehensive Income (Loss). TTEC continues to provide post-petition services to Sears and has assessed these receivables for collection risk and has determined that these will be collectible. Accounts Receivable Sales Agreement The Company is party to an Uncommitted Receivables Purchase Agreement (“Agreement”) with Bank of the West (“Bank”), whereby from time-to-time the Company may elect to sell, on a revolving basis, U.S. accounts receivables of certain clients at a discount to the Bank for cash on a limited recourse basis. The maximum amount of receivables that the Company may sell to the Bank at any given time shall not exceed $75 million. The sales of accounts receivable in accordance with the Agreement are reflected as a reduction of Accounts Receivable, net on the Consolidated Balance sheets. The Company has retained no interest in the sold receivables but retains all collection responsibilities on behalf of the Bank. The discount on the accounts receivable sold will be recorded within Other expense, net in the Consolidated Statements of Comprehensive Income (Loss). The cash proceeds from this Agreement are included in the change in accounts receivable within the operating activities section of the Consolidated Statements of Cash Flow. As of March 31, 2021, the Company had factored $72.0 million of accounts receivable; under the Agreement discounts on these receivables were not material during the quarter. As of March 31, 2021, the Company had collected $16.0 million of cash from customers which had not been remitted to the Bank. The unremitted cash is restricted cash and is included within Prepaid and other current assets with the corresponding liability included in Accrued expenses on the Consolidated Balance Sheet. The Company has not recorded any servicing assets or liabilities as of March 31, 2021 as the fair value of the servicing arrangement as well as the fees earned were not material to the financial statements.

GOODWILL

GOODWILL	3 Months Ended
	Mar. 31, 2021
GOODWILL [ABSTRACT]
GOODWILL.	(5) GOODWILL AND OTHER INTANGIBLE ASSETS ​ Goodwill consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Effect of ​ ​ ​ ​ December 31, ​ Acquisitions / ​ ​ ​ ​ Foreign ​ March 31, ​ ​ 2020 ​ Adjustments ​ Impairments ​ Currency ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ $ 128,211 ​ $ 10 ​ $ — ​ $ (504) ​ $ 127,717 ​ TTEC Engage ​ 235,291 ​ — ​ ​ — ​ ​ (146) ​ 235,145 ​ Total ​ $ 363,502 ​ $ 10 ​ $ — ​ $ (650) ​ $ 362,862 ​ ​ The Company performs a goodwill impairment assessment on at least an annual basis. The Company conducts its annual goodwill impairment assessment during the fourth quarter, or more frequently, if indicators of impairment exist. During the quarter ended March 31, 2021, the Company assessed whether any such indicators of impairment existed and concluded there were none.

DERIVATIVES

DERIVATIVES	3 Months Ended
	Mar. 31, 2021
DERIVATIVES [ABSTRACT]
DERIVATIVES	(6) DERIVATIVES Cash Flow Hedges The Company enters into foreign exchange related derivatives. Foreign exchange derivatives entered into consist of forward and option contracts to reduce the Company’s exposure to foreign currency exchange rate fluctuations that are associated with forecasted revenue earned in foreign locations. Upon proper qualification, these contracts are designated as cash flow hedges. It is the Company’s policy to only enter into derivative contracts with investment grade counterparty financial institutions, and correspondingly, the fair value of derivative assets considers, among other factors, the creditworthiness of these counterparties. Conversely, the fair value of derivative liabilities reflects the Company’s creditworthiness. As of March 31, 2021, the Company has not experienced, nor does it anticipate, any issues related to derivative counterparty defaults. The following table summarizes the aggregate unrealized net gain or loss in Accumulated other comprehensive income (loss) for the three months ended March 31, 2021 and 2020 (in thousands and net of tax): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ ​ ​ 2021 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Aggregate unrealized net gain/(loss) at beginning of period ​ $ 8,431 ​ $ 4,182 ​ ​ Add: Net gain/(loss) from change in fair value of cash flow hedges ​ ​ (3,773) ​ ​ (7,913) ​ ​ Less: Net (gain)/loss reclassified to earnings from effective hedges ​ ​ 1,059 ​ ​ 110 ​ ​ Aggregate unrealized net gain/(loss) at end of period ​ $ 5,717 ​ $ (3,621) ​ ​ ​ The Company’s foreign exchange cash flow hedging instruments as of March 31, 2021 and December 31, 2020 are summarized as follows (amounts in thousands). All hedging instruments are forward contracts. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Local ​ ​ ​ ​ ​ ​ ​ ​ Currency ​ U.S. Dollar ​ ​ % Maturing ​ ​ Contracts ​ ​ Notional ​ Notional ​ ​ in the next ​ ​ Maturing As of March 31, 2021 ​ Amount ​ Amount ​ ​ 12 months ​ ​ Through Canadian Dollar 1,400 ​ $ 1,059 ​ ​ 100 % ​ July 2021 ​ Philippine Peso 5,645,000 ​ 109,143 (1) ​ 58.3 % ​ December 2023 ​ Mexican Peso 1,009,500 ​ 45,454 ​ ​ 56.2 % ​ December 2023 ​ ​ ​ ​ ​ $ 155,656 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Local ​ ​ ​ ​ ​ ​ ​ ​ ​ Currency ​ U.S. Dollar ​ ​ ​ ​ ​ ​ ​ ​ Notional ​ Notional ​ ​ ​ ​ As of December 31, 2020 ​ Amount ​ Amount ​ ​ ​ ​ ​ ​ Canadian Dollar 2,450 ​ $ 1,853 ​ ​ ​ ​ ​ ​ ​ Philippine Peso 6,725,000 ​ 130,468 (1) ​ ​ ​ ​ ​ ​ Mexican Peso 1,159,500 ​ 52,398 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 184,719 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Includes contracts to purchase Philippine pesos in exchange for New Zealand dollars and Australian dollars, which are translated into equivalent U.S. dollars on March 31, 2021 and December 31, 2020. ​ Fair Value Hedges The Company enters into foreign exchange forward contracts to economically hedge against foreign currency exchange gains and losses on certain receivables and payables of the Company’s foreign operations. Changes in the fair value of derivative instruments designated as fair value hedges are recognized in earnings in Other income (expense), net. As of March 31, 2021 and December 31, 2020 the total notional amounts of the Company’s forward contracts used as fair value hedges were $27.8 million and $35.5 million, respectively. Derivative Valuation and Settlements ​ The Company’s derivatives as of March 31, 2021 and December 31, 2020 were as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ Designated Not Designated ​ ​ as Hedging as Hedging ​ Designation: ​ Instruments Instruments ​ Foreign Foreign Derivative contract type: ​ Exchange ​ Exchange Derivative classification: ​ Cash Flow ​ Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value and location of derivative in the Consolidated Balance Sheet: ​ ​ ​ ​ ​ ​ ​ Prepaids and other current assets ​ $ 5,430 ​ $ 40 ​ Other long-term assets ​ 2,657 ​ — ​ Other current liabilities ​ (156) ​ (106) ​ Other long-term liabilities ​ (206) ​ — ​ Total fair value of derivatives, net ​ $ 7,725 ​ $ (66) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Designated Not Designated ​ ​ as Hedging as Hedging ​ Designation: ​ Instruments Instruments ​ Foreign Foreign Derivative contract type: ​ Exchange ​ Exchange Derivative classification: ​ Cash Flow ​ Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value and location of derivative in the Consolidated Balance Sheet: ​ ​ ​ ​ ​ ​ ​ Prepaids and other current assets ​ $ 6,939 ​ $ 103 ​ Other long-term assets ​ 4,528 ​ — ​ Other current liabilities ​ (73) ​ (118) ​ Other long-term liabilities ​ (4) ​ — ​ Total fair value of derivatives, net ​ $ 11,390 ​ $ (15) ​ ​ The effects of derivative instruments on the Consolidated Statements of Comprehensive Income (Loss) for the three months ended March 31, 2021 and 2020 were as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2021 ​ 2020 ​ ​ Designated as Hedging Designation: ​ Instruments Derivative contract type: ​ Foreign Exchange Derivative classification: Cash Flow ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount of gain or (loss) recognized in Other comprehensive income (loss) - effective portion, net of tax ​ $ 1,059 ​ $ 110 ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount and location of net gain or (loss) reclassified from Accumulated OCI to income - effective portion: ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 1,431 ​ $ 151 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2021 ​ 2020 Designation: Not Designated as Hedging Instruments ​ Derivative contract type: Foreign Exchange ​ Derivative classification: Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount and location of net gain or (loss) recognized in the Consolidated Statement of Comprehensive Income (Loss): ​ ​ ​ ​ ​ ​ ​ Other income (expense), net $ (337) $ (330) ​ ​

FAIR VALUE

FAIR VALUE	3 Months Ended
	Mar. 31, 2021
FAIR VALUE [Abstract]
FAIR VALUE	(7) FAIR VALUE The authoritative guidance for fair value measurements establishes a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. This hierarchy requires that the Company maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows: Level 1 — Quoted prices in active markets for identical assets or liabilities. Level 2 — Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, similar assets and liabilities in markets that are not active or can be corroborated by observable market data. Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs. The following presents information as of March 31, 2021 and December 31, 2020 for the Company’s assets and liabilities required to be measured at fair value on a recurring basis, as well as the fair value hierarchy used to determine their fair value. Accounts Receivable and Payable Investments – Debt Derivatives - The following is a summary of the Company’s fair value measurements for its net derivative assets (liabilities) as of March 31, 2021 and December 31, 2020 (in thousands): As of March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ Quoted Prices in Significant ​ ​ ​ ​ ​ Active Markets ​ Other ​ Significant ​ ​ ​ ​ ​ for Identical ​ Observable ​ Unobservable ​ ​ ​ ​ ​ Assets ​ Inputs ​ Inputs ​ ​ ​ ​ ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ At Fair Value Cash flow hedges ​ $ — ​ $ 7,725 ​ $ — ​ $ 7,725 ​ Fair value hedges ​ — ​ (66) ​ — ​ (66) ​ Total net derivative asset (liability) ​ $ — ​ $ 7,659 ​ $ — ​ $ 7,659 ​ ​ As of December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ Quoted Prices in Significant ​ ​ ​ ​ ​ Active Markets ​ Other ​ Significant ​ ​ ​ ​ ​ for Identical ​ Observable ​ Unobservable ​ ​ ​ ​ ​ Assets ​ Inputs ​ Inputs ​ ​ ​ ​ ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ At Fair Value Cash flow hedges ​ $ — ​ $ 11,390 ​ $ — ​ $ 11,390 ​ Fair value hedges ​ — ​ (15) ​ — ​ (15) ​ Total net derivative asset (liability) ​ $ — ​ $ 11,375 ​ $ — ​ $ 11,375 ​ ​ The following is a summary of the Company’s fair value measurements as of March 31, 2021 and December 31, 2020 (in thousands): ​ As of March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ Quoted Prices in ​ ​ Significant ​ ​ Active Markets for ​ Significant Other ​ Unobservable ​ ​ Identical Assets ​ Observable Inputs ​ Inputs ​ ​ (Level 1) ​ (Level 2) ​ (Level 3) Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative instruments, net ​ $ — ​ $ 7,659 ​ $ — ​ Total assets ​ $ — ​ $ 7,659 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred compensation plan liability ​ $ — ​ $ (25,781) ​ $ — ​ Derivative instruments, net ​ ​ — ​ ​ — ​ ​ — ​ Contingent consideration ​ — ​ — ​ (18,909) ​ Total liabilities ​ $ — ​ $ (25,781) ​ $ (18,909) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Redeemable noncontrolling interest ​ $ — ​ $ — ​ $ (54,674) ​ ​ As of December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ Quoted Prices in ​ ​ Significant ​ ​ Active Markets for ​ Significant Other ​ Unobservable ​ ​ Identical Assets ​ Observable Inputs ​ Inputs ​ ​ (Level 1) ​ (Level 2) ​ (Level 3) Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative instruments, net ​ $ — ​ $ 11,375 ​ $ — ​ Total assets ​ $ — ​ $ 11,375 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred compensation plan liability ​ $ — ​ $ (23,858) ​ $ — ​ Derivative instruments, net ​ — ​ — ​ — ​ Contingent consideration ​ — ​ — ​ (18,032) ​ Total liabilities ​ $ — ​ $ (23,858) ​ $ (18,032) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Redeemable noncontrolling interest ​ $ — ​ $ — ​ $ (52,976) ​ ​ Deferred Compensation Plan Contingent Consideration During the first, second and fourth quarters of 2020, the Company recorded fair value adjustments to the contingent consideration associated with the acquisition of FCR LLC based on decreased estimates of EBITDA which caused the estimated payable to decrease. Accordingly, a $3.3 million decrease, a $1.1 million decrease and a $1.8 million decrease to the payable were recorded as of March 31, 2020, June 30, 2020 and December 31, 2020, respectively, and were included in Other income (expense), net in the Consolidated Statements of Comprehensive Income (Loss). As of December 31, 2020, the final calculated contingent consideration for FCR was zero. During the fourth quarter of 2020 and the first quarter of 2021, the Company recorded fair value adjustments to the contingent consideration associated with the VF US and VF ASEAN acquisitions based on increased actual results and estimates of EBITDA for 2021 which caused the payables to increase. Accordingly, a combined $4.3 million increase and $0.9 million increase, to the payables were recorded as of December 31, 2020 and March 31, 2021, respectively, and were included in Other income (expense), net in the Consolidated Statements of Comprehensive Income (Loss). As of March 31, 2021, the expected future contingent consideration for the VF US and VF ASEAN acquisitions is $18.9 million. A rollforward of the activity in the Company’s fair value of the contingent consideration payable is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Imputed ​ ​ ​ ​ December 31, ​ ​ ​ ​ ​ ​ ​ Interest / ​ March 31, ​ ​ 2020 ​ Acquisitions ​ Payments ​ Adjustments ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ VF US ​ $ 14,085 ​ $ — ​ $ — ​ ​ 481 ​ $ 14,566 ​ VF ASEAN ​ 3,947 ​ — ​ — ​ 396 ​ 4,343 ​ Total ​ $ 18,032 ​ $ — ​ $ — ​ $ 877 ​ $ 18,909 ​ ​

INCOME TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2021
INCOME TAXES [ABSTRACT]
INCOME TAXES	(8) INCOME TAXES The Company accounts for income taxes in accordance with the accounting literature for income taxes, which requires recognition of deferred tax assets and liabilities for the expected future income tax consequences of transactions that have been included in the Consolidated Financial Statements. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities using tax rates in effect for the year in which the differences are expected to reverse. Quarterly, the Company assesses the likelihood that its net deferred tax assets will be recovered. Based on the weight of all available evidence, both positive and negative, the Company records a valuation allowance against deferred tax assets when it is more-likely-than-not that a future tax benefit will not be realized. The Company’s selection of an accounting policy with respect to both the global intangible low taxed foreign income (“GILTI”) and base erosion and anti-abuse tax (“BEAT”) rules is to compute the related taxes in the period the entity becomes subject to either GILTI or BEAT. As of March 31, 2021, the Company had $15.5 million of gross deferred tax assets (after a $20.3 million valuation allowance) and a net deferred tax asset of $9.1 million (after deferred tax liabilities of $6.4 million) related to the United States and international tax jurisdictions whose recoverability is dependent upon future profitability. In accordance with ASC 740, during the third quarter of 2020 the Company recorded a liability of $1.7 million related to an uncertain tax position. The effective tax rate for the three months ended March 31, 2021 and 2020 was 22.5% and 29.2%, respectively. The Company’s U.S. income tax returns filed for the tax years ending December 31, 2017 to present, remain open tax years. The Company has been notified of the intent to audit or is currently under audit of income taxes for the United States for tax year 2017 and 2018, and the Philippines for tax years 2017 and 2018. Although the outcome of examinations by taxing authorities are always uncertain, it is the opinion of management that the resolution of these audits will not have a material effect on the Company’s Consolidated Financial Statements. When there is a change in judgment concerning the recovery of deferred tax assets in future periods, a valuation allowance is recorded into earnings during the quarter in which the change in judgment occurred. In the first quarter of 2020, changes to the valuation allowance were recorded in the amounts of $0.3 million, for deferred tax assets that did not meet the “more-likely-than-not” standard. In the second quarter of 2020, changes to the valuation allowance were recorded in the amount of $0.9 million for assets that were redetermined to meet the “more-likely-than-not” standard. In the first quarter of 2021, a change to the valuation allowance was recorded in the amount of $2.4 million for assets that did not meet the “more-likely-than-not” standard. The Company has been granted “Tax Holidays” as an incentive to attract foreign investment by the government of the Philippines. Generally, a Tax Holiday is an agreement between the Company and a foreign government under which the Company receives certain tax benefits in that country, such as exemption from taxation on profits derived from export-related activities. In the Philippines, the Company has been granted multiple agreements with an initial period of four years and additional periods for varying years, expiring at various times between 2021 and 2022. The aggregate effect on income tax expense for the three months ended March 31, 2021 and 2020 was approximately $1.1 million and $1.4 million benefit, respectively, which had an impact on diluted net income per share of $0.02 and $0.03, respectively. ​

RESTRUCTURING CHARGES, INTEGRAT

RESTRUCTURING CHARGES, INTEGRATION CHARGES AND IMPAIRMENT LOSSES	3 Months Ended
	Mar. 31, 2021
RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES [Abstract]
RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES	(9) RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES Restructuring Charges During 2021 and 2020, the Company continued restructuring activities primarily associated with reductions in the Company’s capacity, workforce and related management in both segments to better align the capacity and workforce with current business needs. TTEC determined it would close several delivery centers servicing the Engage segment and the expenses related to early termination fees and cease use lease accruals were recorded. This expense was included in the Restructuring charges, net in the Consolidated Statements of Comprehensive Income (Loss). A summary of the expenses recorded in Restructuring charges, net in the accompanying Consolidated Statements of Comprehensive Income (Loss) for the three months ended March 31, 2021 and 2020, respectively, is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ ​ 2021 2020 Reduction in force ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ $ — $ 207 TTEC Engage ​ — ​ 236 ​ Total ​ $ — $ 443 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ ​ 2021 2020 Facility exit and other charges ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ $ 8 $ — ​ TTEC Engage ​ 394 ​ 95 ​ Total ​ $ 402 $ 95 ​ ​ A rollforward of the activity in the Company’s restructuring accrual is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reduction ​ Facility Exit and ​ ​ ​ ​ ​ in Force ​ Other Charges ​ Total ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance as of December 31, 2020 ​ $ 156 $ 543 $ 699 ​ Expense ​ — ​ ​ 402 ​ 402 ​ Payments ​ — ​ ​ (502) ​ (502) ​ Change due to foreign currency ​ ​ — ​ ​ 1 ​ ​ 1 ​ Change in estimates ​ — ​ ​ — ​ — ​ Balance as of March 31, 2021 ​ $ 156 $ 444 $ 600 ​ ​ The remaining restructuring and other accruals are expected to be paid or extinguished during the next twelve months and are all classified as current liabilities within Other accrued expenses in the Consolidated Balance Sheets. Severance Charges In the normal course of business, the Company will pay severance to terminated employees related to programs that are ending who are no longer needed and cannot be repurposed to a new program. During the second quarter of 2020, a $3.0 million accrual was recorded with the expense included in Cost of services during the quarter ended June 30, 2020. During the third and fourth quarters of 2020, a total of $1.6 million was paid and a $0.3 million reduction in expense was recorded. During the first quarter of 2021, a total of $0.3 million was paid and a $0.1 million reduction in expense was recorded. The accrual is expected to be paid or extinguished during the next six months and thus is classified as current liabilities within Other accrued expenses in the Consolidated Balance Sheets. Impairment Losses During each of the periods presented, the Company evaluated the recoverability of its leasehold improvement assets at certain customer engagement centers. An asset is considered to be impaired when the anticipated undiscounted future cash flows of its asset group are estimated to be less than the asset group’s carrying value. The amount of impairment recognized is the difference between the carrying value of the asset group and its fair value. To determine fair value, the Company used Level 3 inputs in its discounted cash flows analysis. Assumptions included the amount and timing of estimated future cash flows and assumed discount rates. During the three months ended March 31, 2021 and 2020, the Company recognized impairment losses, net related to leasehold improvement assets and right of use lease assets of $2.4 million and $0.7 million, respectively, across the TTEC Digital and TTEC Engage segments.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2021
COMMITMENTS AND CONTINGENCIES [Abstract]
COMMITMENTS AND CONTINGENCIES	(10) COMMITMENTS AND CONTINGENCIES Credit Facility On March 25, 2021, the Company entered into a Fifth Amendment to its Amended and Restated Credit Agreement and Amended and Restated Security Agreement originally dated as of June 3, 2013, (collectively, the “Credit Facility”) to increase the total commitments by $300 million to $1.2 billion by exercising the accordion feature that was included in the senior secured revolving credit facility with a syndicate of lenders led by Wells Fargo Bank, National Association, as agent, swingline and fronting lender. The Credit Facility matures on February 14, 2024. The $300 million increase is in the form of a term loan, which can be prepaid anytime and will become due February 14, 2024, contemporaneously with the expiration of the revolving line of credit. The maximum commitment under the Credit Facility is $1.2 billion in the aggregate, if certain conditions are satisfied. The Credit Facility commitment fees are payable to the lenders in an amount equal to the unused portion of the Credit Facility multiplied by a rate per annum as determined by reference to the Company’s net leverage ratio. The Credit Agreement contains customary affirmative, negative, and financial covenants, which remained unchanged from the 2016 Credit Facility, except that the Company is now obligated to maintain a maximum net leverage ratio of 3.50 to 1.00, and a minimum interest coverage ratio of 2.50 to 1.00. The Credit Agreement permits accounts receivable factoring up to the greater of $75 million or 25 percent of the average book value of all accounts receivable over the most recent twelve-month period. Base rate loans bear interest at a rate equal to the greatest of (i) Wells Fargo’s prime rate, (ii) one half of 1% Letter of credit fees are one eighth of 1% of the stated amount of the letter of credit on the date of issuance, renewal or amendment, plus an annual fee equal to the borrowing margin for Eurodollar loans. The Company primarily utilizes its Credit Facility to fund working capital, general operations, dividends and other strategic activities, such as the acquisitions described in Note 2. As of March 31, 2021 and December 31, 2020, the Company had borrowings of $339.0 million and $385.0 million, respectively, under its Credit Facility, and its average daily utilization was $446.1 million and $397.7 million for the three months ended March 31, 2021 and 2020, respectively. The Company had increased borrowings under the Credit Facility from late March 2020 through late September 2020, related to precautionary measures taken to proactively strengthen the Company’s cash reserves and financial flexibility in response to COVID-19 related uncertainties. As of September 30, 2020, those additional borrowings had been repaid. Based on the current level of availability based on the covenant calculations, the Company’s remaining borrowing capacity was approximately $855 million as of March 31, 2021. As of March 31, 2021, the Company was in compliance with all covenants and conditions under its Credit Agreement. In early April 2021, the Company drew down approximately $500 million of the availability on the Credit Facility in order to provide funding for the Company’s acquisition of Avtex Solutions, Holdings LLC. (See Note 2). Letters of Credit As of March 31, 2021, outstanding letters of credit under the Credit Facility totaled $2.8 million and primarily guaranteed workers’ compensation and other insurance related obligations. As of March 31, 2021, letters of credit and contract performance guarantees issued outside of the Credit Agreement totaled $0.5 million. Legal Proceedings From time to time, the Company has been involved in legal actions, both as plaintiff and defendant, which arise in the ordinary course of business. The Company accrues for exposures associated with such legal actions to the extent that losses are deemed both probable and reasonably estimable. To the extent specific reserves have not been made for certain legal proceedings, their ultimate outcome, and consequently, an estimate of possible loss, if any, cannot reasonably be determined at this time. Based on currently available information and advice received from counsel, the Company believes that the disposition or ultimate resolution of any current legal proceedings, except as otherwise specifically reserved for in its financial statements, will not have a material adverse effect on the Company’s financial position, cash flows or results of operations.

LEASES

LEASES	3 Months Ended
	Mar. 31, 2021
LEASES [ABSTRACT]
Leases	(11) LEASES ​ Operating leases are included in the Consolidated Balance Sheet as Operating lease assets, Current operating lease liabilities and Non-current operating lease liabilities. Finance leases are included in Property, plant and equipment, Other current liabilities and Other long-term liabilities in the Consolidated Balance Sheet. The Company primarily leases real estate and equipment under various arrangements that provide the Company the right of use for the underlying asset that require lease payments over the lease term. The Company determines the value of each lease by computing the present value of each lease payment using the interest rate implicit in the lease, if available; otherwise the Company estimates its incremental borrowing rate over the lease term. The Company determines its incremental borrowing rate based on its estimated credit risk with adjustments for each individual leases’ geographical risk and lease term. Operating lease assets also include prepaid rent and initial direct costs less any tenant improvements. The Company’s real estate portfolio typically includes one or more options to renew can extend the lease term one The components of lease expense for the three months ended March 31, 2021 and 2020 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location in Statements of ​ Three Months Ended March 31, ​ Description ​ Comprehensive Income (Loss) 2021 2020 Amortization of ROU assets - finance leases ​ Depreciation and amortization ​ $ 1,804 ​ $ 1,916 ​ Interest on lease liabilities - finance leases ​ Interest expense ​ ​ 40 ​ ​ 56 Operating lease cost (cost resulting from lease payments) ​ Cost of services ​ 10,439 ​ 12,038 ​ Operating lease cost (cost resulting from lease payments) ​ Selling, general and administrative ​ ​ 606 ​ ​ 542 ​ Operating lease cost (cost resulting from lease payments) ​ Restructuring ​ ​ 240 ​ ​ — ​ Operating lease cost (cost resulting from lease payments) ​ Impairment ​ ​ 1,697 ​ ​ — ​ Operating lease cost (cost resulting from lease payments) ​ Other income (expense), net ​ ​ 310 ​ ​ 242 ​ Short-term lease cost ​ Cost of services ​ 966 ​ 997 ​ Variable lease cost (cost excluded from lease payments) ​ Cost of services ​ ​ 318 ​ ​ — ​ Less: Sublease income ​ Selling, general and administrative ​ ​ (228) ​ ​ (182) ​ Less: Sublease income ​ Other income (expense), net ​ (676) ​ (496) ​ Total lease cost ​ ​ ​ $ 15,516 $ 15,113 ​ ​ Other supplementary information for the three months ended March 31, 2021 and 2020 are as follows (dollar values in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2021 2020 Finance lease - operating cash flows ​ $ 14 ​ $ 19 ​ Finance lease - financing cash flows ​ $ 1,792 ​ $ 2,132 ​ Operating lease - operating cash flows (fixed payments) ​ $ 13,498 ​ $ 14,137 ​ New ROU assets - operating leases ​ $ 3,362 ​ $ 6,548 ​ Modified ROU assets - operating leases ​ $ — ​ $ — ​ New ROU assets - finance leases ​ $ 95 ​ $ 508 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ December 31, 2020 ​ Weighted average remaining lease term - finance leases ​ ​ 2.34 years ​ ​ 2.46 years ​ Weighted average remaining lease term - operating leases ​ ​ 3.60 years ​ ​ 3.73 years ​ Weighted average discount rate - finance leases ​ ​ 1.72% ​ ​ 1.64% ​ Weighted average discount rate - operating leases ​ ​ 6.88% ​ ​ 6.95% ​ ​ Operating and financing lease right-of-use assets and lease liabilities within the Consolidated Balance Sheet as of March 31, 2021 and December 31, 2020 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Description Location in Balance Sheet ​ March 31, 2021 ​ December 31, 2020 Assets ​ ​ ​ ​ ​ ​ ​ ​ Operating lease assets Operating lease assets ​ $ 112,129 ​ $ 120,820 ​ Finance lease assets Property, plant and equipment, net ​ 10,947 ​ 12,659 ​ Total leased assets ​ ​ $ 123,076 ​ $ 133,479 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ Current ​ ​ ​ ​ ​ ​ ​ ​ Operating Current operating lease liabilities ​ $ 43,043 ​ $ 43,651 ​ Finance Other current liabilities ​ ​ 5,558 ​ ​ 6,193 ​ Non-current ​ ​ ​ ​ ​ ​ ​ ​ Operating Non-current operating lease liabilities ​ ​ 89,967 ​ ​ 98,277 ​ Finance Other long-term liabilities ​ ​ 3,766 ​ ​ 4,763 ​ Total lease liabilities ​ ​ $ 142,334 ​ $ 152,884 ​ ​ The future minimum operating lease and finance lease payments required under non-cancelable leases as of March 31, 2021 and December 31, 2020 are as follows (in thousands): March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Sub-lease Finance ​ ​ Leases ​ Income ​ Leases Year 1 ​ $ 49,738 ​ $ (3,500) ​ $ 5,609 ​ Year 2 ​ 45,668 ​ (3,488) ​ 2,150 ​ Year 3 ​ 26,224 ​ (2,947) ​ 1,402 ​ Year 4 ​ 16,167 ​ (2,940) ​ 355 ​ Year 5 ​ 6,467 ​ (2,695) ​ — ​ Thereafter ​ 7,581 ​ — ​ — ​ Total minimum lease payments ​ $ 151,845 ​ $ (15,570) ​ $ 9,516 ​ Less imputed interest ​ ​ (18,835) ​ ​ ​ ​ ​ (192) ​ Total lease liability ​ $ 133,010 ​ ​ ​ ​ $ 9,324 ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Sub-lease Finance ​ ​ Leases ​ Income ​ Leases Year 1 ​ $ 51,120 ​ $ (3,500) ​ $ 6,237 ​ Year 2 ​ 46,913 ​ (3,489) ​ 2,740 ​ Year 3 ​ 31,085 ​ (3,123) ​ 1,631 ​ Year 4 ​ 17,338 ​ (2,905) ​ 579 ​ Year 5 ​ 8,288 ​ (2,940) ​ — ​ Thereafter ​ 8,397 ​ (490) ​ — ​ Total minimum lease payments ​ $ 163,141 ​ $ (16,447) ​ $ 11,187 ​ Less imputed interest ​ ​ (21,213) ​ ​ ​ ​ ​ (231) ​ Total lease liability ​ $ 141,928 ​ ​ ​ ​ $ 10,956 ​ ​ In 2008, the Company sub-leased one of its customer engagement centers to a third party for the remaining term of the lease. The sub-lease began on January 1, 2009 and rental income will be recognized on a straight-line basis over the term of the sub-lease through 2026

OTHER LONG TERM LIAB

OTHER LONG TERM LIAB	3 Months Ended
	Mar. 31, 2021
Other Liabilities, Noncurrent [Abstract]
Other Liabilities Disclosure [Text Block]	(12) OTHER LONG-TERM LIABILITIES ​ The components of Other long-term liabilities as of March 31, 2021 and December 31, 2020 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred revenue ​ ​ $ 19,203 $ 17,434 ​ Deferred compensation plan ​ ​ ​ 25,781 ​ ​ 23,858 ​ Other ​ ​ 55,170 ​ 54,893 ​ Total ​ ​ $ 100,154 $ 96,185 ​ ​

NONCONTROLLING INTEREST

NONCONTROLLING INTEREST	3 Months Ended
	Mar. 31, 2021
NONCONTROLLING INTEREST [Abstract]
Noncontrolling Interest	(13) NONCONTROLLING INTEREST ​ The following table reconciles equity attributable to noncontrolling interest in the Company’s subsidiary (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ 2021 2020 Noncontrolling interest, January 1 $ 13,060 $ 13,186 ​ Net income attributable to noncontrolling interest ​ 2,908 ​ 2,216 ​ Dividends distributed to noncontrolling interest ​ (2,385) ​ (1,850) ​ Foreign currency translation adjustments ​ 126 ​ (516) ​ Noncontrolling interest, March 31 $ 13,709 $ 13,036 ​ ​

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	3 Months Ended
	Mar. 31, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [ABSTRACT]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	(14) ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ​ The following table presents changes in the accumulated balance for each component of Other comprehensive income (loss), including current period other comprehensive income (loss) and reclassifications out of accumulated other comprehensive income (loss) (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ ​ ​ ​ ​ ​ ​ Currency ​ Derivative ​ ​ ​ ​ ​ ​ ​ ​ Translation ​ Valuation, Net ​ Other, Net ​ ​ ​ ​ ​ Adjustment ​ of Tax ​ of Tax ​ Totals ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accumulated other comprehensive income (loss) at December 31, 2019 ​ $ (107,480) $ 4,182 $ (2,936) $ (106,234) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive income (loss) before reclassifications ​ (29,298) ​ (7,913) ​ 258 ​ (36,953) ​ Amounts reclassified from accumulated other comprehensive income (loss) ​ — ​ 110 ​ (131) ​ (21) ​ Net current period other comprehensive income (loss) ​ (29,298) ​ (7,803) ​ 127 ​ (36,974) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accumulated other comprehensive income (loss) at March 31, 2020 ​ $ (136,778) $ (3,621) $ (2,809) $ (143,208) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accumulated other comprehensive income (loss) at December 31, 2020 ​ $ (78,139) $ 8,431 $ (2,448) $ (72,156) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive income (loss) before reclassifications ​ (5,879) ​ ​ (3,773) ​ ​ 108 ​ (9,544) ​ Amounts reclassified from accumulated other comprehensive income (loss) ​ — ​ ​ 1,059 ​ ​ (72) ​ 987 ​ Net current period other comprehensive income (loss) ​ (5,879) ​ (2,714) ​ 36 ​ (8,557) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accumulated other comprehensive income (loss) at March 31, 2021 ​ $ (84,018) $ 5,717 $ (2,412) $ (80,713) ​ ​ The following table presents the classification and amount of the reclassifications from Accumulated other comprehensive income (loss) to the Statement of Comprehensive Income (Loss) (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months Ended ​ Statement of ​ ​ ​ March 31, ​ Comprehensive Income ​ ​ 2021 2020 (Loss) Classification ​ Derivative valuation ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain (loss) on foreign currency forward exchange contracts ​ $ 1,431 ​ $ 151 Revenue ​ Tax effect ​ (372) ​ (41) Provision for income taxes ​ ​ ​ $ 1,059 ​ $ 110 Net income (loss) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ Actuarial loss on defined benefit plan ​ $ (80) ​ $ (146) Cost of services ​ Tax effect ​ 8 ​ 15 Provision for income taxes ​ ​ ​ $ (72) ​ $ (131) Net income (loss) ​ ​

WEIGHTED AVERAGE SHARE COUNTS

WEIGHTED AVERAGE SHARE COUNTS	3 Months Ended
	Mar. 31, 2021
Weighted Average Share Counts
NET INCOME PER SHARE	(15) WEIGHTED AVERAGE SHARE COUNTS ​ The following table sets forth the computation of basic and diluted shares for the periods indicated (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ 2021 2020 ​ ​ ​ ​ ​ ​ Shares used in basic earnings per share calculation ​ 46,743 46,498 Effect of dilutive securities: ​ ​ ​ ​ ​ Restricted stock units ​ 612 315 Performance-based restricted stock units ​ — — Total effects of dilutive securities ​ 612 315 Shares used in dilutive earnings per share calculation ​ 47,355 46,813 ​ For the three months ended March 31, 2021 and 2020, there were Restricted Stock Units (“RSUs“) of zero and 66 thousand, respectively, outstanding which were excluded from the computation of diluted net income per share because the effect would have been anti-dilutive.

EMPLOYEE COMPENSATION PLANS

EMPLOYEE COMPENSATION PLANS	3 Months Ended
	Mar. 31, 2021
EMPLOYEE COMPENSATION PLANS [Abstract]
EMPLOYEE COMPENSATION PLANS	(16) EQUITY-BASED COMPENSATION PLANS All equity-based awards to employees are recognized in the Consolidated Statements of Comprehensive Income (Loss) at the fair value of the award on the grant date. During the three months ended March 31, 2021 and 2020, the Company recognized total equity-based compensation expense of $4.0 million and $2.9 million, respectively. Of this total compensation expense, $1.3 million and $1.0 million were recognized in Cost of services and $2.7 million and $1.9 million were recognized in Selling, general and administrative during the three months ended March 31, 2021 and 2020, respectively. Restricted Stock Unit Grants During the three months ended March 31, 2021 and 2020, the Company granted 44,471 and 112,915 RSUs, respectively, to new and existing employees, which vest over four Performance Based Restricted Stock Unit Grants 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. The Company recognized compensation expense related to PRSUs of $0.3 million and $0.4 million, respectively, for the three months ended March 31, 2021 and 2020. 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 for the three months ended March 31, 2021.

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	3 Months Ended
	Mar. 31, 2021
RELATED PARTY TRANSACTIONS [ABSTRACT]
RELATED PARTY TRANSACTIONS	(17) RELATED PARTY TRANSACTIONS The Company entered into an agreement under which Avion, LLC (“Avion”) and Airmax LLC (“Airmax”) provide certain aviation flight services as requested by the Company. Such services include the use of an aircraft and flight crew. Kenneth D. Tuchman, Chairman and Chief Executive Officer of the Company, has an indirect 100% beneficial ownership interest in Avion and Airmax. During the three months ended March 31, 2021 and 2020, the Company expensed $0.3 million and $0.1 million, respectively, to Avion and Airmax for services provided to the Company. There was $255 thousand in payments due and outstanding to Avion and Airmax as of March 31, 2021. Ms. Regina M. Paolillo, Chief Financial and Administrative Officer of the Company, is a member of the board of directors of Welltok, Inc., a consumer health SaaS company. Welltok, Inc. is a partner with the Company in a joint venture Welltok TTEC Communications, LLC. During the three months ended March 31, 2021 and 2020, the Company recorded revenue of $0.5 million and $0.9 million, respectively, in connection with work performed through the joint venture. ​

OVERVIEW AND SUMMARY OF SIGNIFI

OVERVIEW AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2021
OVERVIEW AND BASIS OF PRESENTATION [Abstract]
Overview	Summary of Business TTEC Holdings, Inc. (“TTEC”, “the Company”) is a leading global customer experience as a service (“CXaaS”) partner for many of the world’s iconic brands, Fortune 1000 companies, government agencies, and disruptive growth companies. TTEC helps its clients deliver frictionless customer experiences, strengthen customer relationships, brand recognition and loyalty through personalized interactions, improve their Net Promoter Score, customer satisfaction and quality assurance, and lower their total cost to serve by combining innovative digital solutions with best-in-class service capabilities to enable and deliver simplified, consistent and seamless customer experience across channels and phases of the customer lifecycle. TTEC’s 58,500 employees serve clients in the automotive, communication, financial services, national/federal and state and local governments, healthcare, logistics, media and entertainment, e-tail/retail, technology, travel and transportation industries via operations in the United States, Australia, Belgium, Brazil, Bulgaria, Canada, Costa Rica, Germany, Greece, India, Ireland, Mexico, the Netherlands, New Zealand, the Philippines, Poland, Singapore, South Africa, Thailand, and the United Kingdom. The Company reports its financial information based on two segments: TTEC Digital and TTEC Engage. ● TTEC Digital provides the CX technology services and platforms to support the Company’s clients’ customer interaction delivery infrastructure. The segment designs, builds and operates the omnichannel ecosystem in a cloud, on premise, or hybrid environment, and fully integrates, orchestrates, and administers highly scalable, feature-rich CX technology applications. ● TTEC Engage provides the CX managed services to support the Company’s clients’ end-to-end customer interaction delivery, by providing the essential CX omnichannel and application technologies, human resources, recruiting, training and production, at-home or facility-based delivery infrastructure on a global scale, and engagement processes. This segment provides full-service digital, omnichannel customer engagement, supporting customer care, customer acquisition, growth and retention, and fraud detection and prevention services. TTEC Digital and TTEC Engage strategically come together under the Company’s unified offering, Humanify ® ®
Basis Of Presentation	Basis of Presentation The Consolidated Financial Statements are comprised of the accounts of TTEC, its wholly owned subsidiaries, its 55% equity owned subsidiary Percepta, LLC, its 70% equity owned subsidiary First Call Resolution, LLC and its 70% equity owned subsidiary Serendebyte, Inc. (see Note 2). All intercompany balances and transactions have been eliminated in consolidation. The unaudited Consolidated Financial Statements do not include all of the disclosures required by accounting principles generally accepted in the U.S. (“GAAP”), pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). The unaudited Consolidated Financial Statements reflect all adjustments which, in the opinion of management, are necessary to state fairly the consolidated financial position of the Company and the consolidated results of operations and comprehensive income (loss) and the consolidated cash flows of the Company. All such adjustments are of a normal, recurring nature. Operating results for the periods presented are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. These unaudited Consolidated Financial Statements should be read in conjunction with the Company’s audited Consolidated Financial Statements and footnotes thereto included in the Company’s Annual Report on Form 10-K
Use of Estimates	Use of Estimates The preparation of the Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions in determining the reported amounts of assets and liabilities, disclosure of contingent liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenue and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates including those related to derivatives and hedging activities, income taxes including the valuation allowance for deferred tax assets, litigation reserves, restructuring reserves, allowance for credit losses, contingent consideration, redeemable noncontrolling interest, and valuation of goodwill, long-lived and intangible assets. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ materially from these estimates under different assumptions or conditions.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents consist of cash, primarily held in interest-bearing investments, and liquid short-term investments which have original maturities of less than 90 days. Restricted cash includes cash whereby the Company’s ability to use the funds at any time is contractually limited or is generally designated for specific purposes arising out of certain contractual or other obligations. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in the Condensed Consolidated Balance Sheets that sum to the amounts reported in the Condensed Consolidated Statement of Cash Flows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ ​ $ 144,213 $ 132,914 ​ Restricted cash included in "Prepaid and other current assets" ​ ​ 16,023 ​ 26,101 ​ Restricted cash included in "Other noncurrent assets" ​ ​ — ​ — ​ Total ​ ​ $ 160,236 $ 159,015 ​
Concentration of Credit Risk	Concentration of Credit Risk The Company is exposed to credit risk in the normal course of business, primarily related to accounts receivable and derivative instruments. Historically, the losses related to credit risk have been immaterial. The Company regularly monitors its credit risk to mitigate the possibility of current and future exposures resulting in a loss. The Company evaluates the creditworthiness of its clients prior to entering into an agreement to provide services and as necessary through the life of the client relationship. The Company does not believe it is exposed to more than a nominal amount of credit risk in its derivative hedging activities, as the Company diversifies its activities across eight investment-grade financial institutions.
Recently Issued Accounting Pronouncements	Recently Adopted Accounting Pronouncements In December 2019, the FASB issued ASU 2019-12, “Simplifying the Accounting for Income Taxes” (ASU 740), which is intended to simplify various aspects related to income tax accounting. The ASU is effective for interim and annual periods beginning on or after December 15, 2020, with early adoption permitted. The Company adopted the new guidance effective January 1, 2021 and the adoption had no effect on the financial statements or related disclosures during the quarter. Other Accounting Pronouncements In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform” (Topic 848), which provides optional expedients and exceptions for contracts, hedging relationships, and other transactions affected by reference rate reform due to the anticipated cessation of LIBOR on or before December 31, 2021. The ASU is effective from March 12, 2020, through December 31, 2022 and could impact the accounting for LIBOR provisions in the Company’s credit facility agreement. In addition, in January 2021, the FASB issued ASU 2021-01, “Reference Rate Reform – Scope,” which clarified the scope of ASC 848 relating to contract modifications. The Company has not yet adopted the standard but does not expect that the adoption of this guidance will have a material impact on the Company’s financial position, results of operations or cash flows.

OVERVIEW AND BASIS OF PRESENT_2

OVERVIEW AND BASIS OF PRESENTATION (Tables)	3 Months Ended
	Mar. 31, 2021
OVERVIEW AND BASIS OF PRESENTATION [Abstract]
Restrictions on Cash and Cash Equivalents [Table Text Block]	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in the Condensed Consolidated Balance Sheets that sum to the amounts reported in the Condensed Consolidated Statement of Cash Flows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ ​ $ 144,213 $ 132,914 ​ Restricted cash included in "Prepaid and other current assets" ​ ​ 16,023 ​ 26,101 ​ Restricted cash included in "Other noncurrent assets" ​ ​ — ​ — ​ Total ​ ​ $ 160,236 $ 159,015 ​

ACQUISITIONS AND DIVESTITURES (

ACQUISITIONS AND DIVESTITURES (Tables)	3 Months Ended
	Mar. 31, 2021
Voice Foundry US
Schedule of Assets Acquired and Liabilities Assumed	The following summarizes the fair values of the identifiable assets acquired and liabilities assumed as of the acquisition date (in thousands): ​ ​ ​ ​ ​ ​ ​ Acquisition Date ​ ​ Fair Value Accounts receivable, net ​ $ 3,758 ​ Prepaid and other expenses ​ 345 ​ Tradename ​ 400 ​ Non-compete ​ 150 ​ Customer relationships ​ 6,550 ​ Goodwill ​ ​ 35,881 ​ ​ ​ $ 47,084 ​ ​ ​ ​ ​ ​ Accounts payable ​ $ 289 ​ Accrued employee compensation ​ 741 ​ Deferred revenue ​ 170 ​ ​ ​ $ 1,200 ​ ​ ​ ​ ​ ​ Total purchase price ​ $ 45,884 ​
Voice Foundry ASEAN
Schedule of Assets Acquired and Liabilities Assumed	The following summarizes the estimated fair values of the identifiable assets acquired and liabilities assumed as of the acquisition date (in thousands): ​ ​ ​ ​ ​ ​ Preliminary ​ ​ Estimate of ​ ​ Acquisition Date ​ ​ Fair Value Cash ​ $ 1,300 ​ Accounts receivable, net ​ ​ 937 ​ Prepaid and other expenses ​ 115 ​ Income tax receivable ​ ​ 30 ​ Property, plant and equipment ​ ​ 274 ​ Tradename ​ 300 ​ Customer relationships ​ 3,100 ​ Goodwill ​ ​ 14,418 ​ ​ ​ $ 20,474 ​ ​ ​ ​ ​ ​ Accounts payable ​ $ 960 ​ Accrued employee compensation ​ 113 ​ Deferred revenue ​ ​ 236 ​ Deferred tax liability ​ ​ 1,013 ​ Other accrued liabilities ​ (78) ​ ​ ​ $ 2,244 ​ ​ ​ ​ ​ ​ Total purchase price ​ $ 18,230 ​
Serendebyte
Schedule of Assets Acquired and Liabilities Assumed	The following summarizes the fair values of the identifiable assets acquired and liabilities assumed as of the acquisition date (in thousands): ​ ​ ​ ​ ​ ​ ​ Acquisition Date ​ ​ Fair Value Cash ​ $ 3,123 ​ Accounts receivable, net ​ 1,243 ​ Prepaid and other assets ​ 1,327 ​ Property, plant and equipment ​ ​ 20 ​ Deferred tax assets ​ ​ 14 ​ Tradename ​ ​ 400 ​ Customer relationships ​ ​ 1,920 ​ Goodwill ​ ​ 9,033 ​ ​ ​ $ 17,080 ​ ​ ​ ​ ​ ​ Accounts payable ​ $ 120 ​ Accrued employee compensation and benefits ​ 1,025 ​ Accrued income taxes ​ 170 ​ Accrued expenses ​ ​ 2,208 ​ Deferred tax liabilities - long-term ​ 629 ​ ​ ​ $ 4,152 ​ ​ ​ ​ ​ ​ Total purchase price ​ $ 12,928 ​

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2021
SEGMENT INFORMATION [ABSTRACT]
Schedule of Segment Selected Financial Data	The following tables present certain financial data by segment (in thousands): Three Months Ended March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Depreciation Income ​ ​ Gross ​ Intersegment ​ Net ​ & ​ from ​ ​ Revenue ​ Sales ​ Revenue ​ Amortization ​ Operations TTEC Digital ​ $ 63,609 ​ $ (22) ​ $ 63,587 ​ $ 3,887 ​ $ 4,202 ​ TTEC Engage ​ 475,632 ​ — ​ 475,632 ​ 16,572 ​ 69,222 ​ Total ​ $ 539,241 ​ $ (22) ​ $ 539,219 ​ $ 20,459 ​ $ 73,424 ​ ​ Three Months Ended March 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Depreciation Income ​ ​ ​ Gross ​ Intersegment ​ Net ​ & ​ from ​ ​ ​ Revenue ​ Sales ​ Revenue ​ Amortization ​ Operations ​ TTEC Digital ​ $ 77,781 ​ $ (225) ​ $ 77,556 ​ $ 3,288 ​ $ 10,258 ​ TTEC Engage ​ 354,657 ​ ​ — ​ 354,657 ​ 15,584 ​ 30,458 ​ Total ​ $ 432,438 ​ $ (225) ​ $ 432,213 ​ $ 18,872 ​ $ 40,716 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ ​ ​ March 31, ​ ​ ​ 2021 2020 Capital Expenditures ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ $ 1,532 $ 2,438 TTEC Engage ​ 10,033 ​ 14,375 ​ Total ​ $ 11,565 $ 16,813 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 December 31, 2020 ​ Total Assets ​ ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ ​ $ 268,063 $ 277,365 ​ TTEC Engage ​ ​ 1,227,590 ​ 1,239,043 ​ Total ​ ​ $ 1,495,653 $ 1,516,408 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 December 31, 2020 ​ Goodwill ​ ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ ​ $ 127,717 $ 128,211 ​ TTEC Engage ​ ​ 235,145 ​ 235,291 ​ Total ​ ​ $ 362,862 $ 363,502 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of Revenue by Geographic Area	The following table presents revenue based upon the geographic location where the services are provided (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ ​ 2021 2020 ​ Revenue ​ ​ ​ ​ ​ ​ ​ ​ United States ​ $ 358,326 ​ $ 277,676 ​ Philippines ​ 102,252 ​ 91,105 ​ ​ Latin America ​ 29,439 ​ 25,098 ​ ​ Europe / Middle East / Africa ​ 25,917 ​ 16,944 ​ ​ Asia Pacific / India ​ 16,167 ​ 15,168 ​ ​ Canada ​ 7,118 ​ 6,222 ​ ​ Total ​ $ 539,219 $ 432,213 ​ ​

ACCOUNTS RECEIVABLE AND SIGNIFI

ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS (Tables)	3 Months Ended
	Mar. 31, 2021
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract]
Schedule of Change in Allowance for Doubtful Accounts	Activity in the Company’s Allowance for credit losses consists of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ 2021 2020 Balance, beginning of year ​ $ 5,067 ​ $ 5,452 ​ Provision for credit losses ​ 21 ​ 162 ​ Uncollectible receivables written-off ​ (83) ​ (208) ​ Effect of foreign currency ​ (8) ​ (4) ​ Balance, end of year ​ $ 4,997 ​ $ 5,402 ​

GOODWILL (Tables)

GOODWILL (Tables)	3 Months Ended
	Mar. 31, 2021
GOODWILL [ABSTRACT]
Schedule of Goodwill Rollforward	Goodwill consisted of the following (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Effect of ​ ​ ​ ​ December 31, ​ Acquisitions / ​ ​ ​ ​ Foreign ​ March 31, ​ ​ 2020 ​ Adjustments ​ Impairments ​ Currency ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ $ 128,211 ​ $ 10 ​ $ — ​ $ (504) ​ $ 127,717 ​ TTEC Engage ​ 235,291 ​ — ​ ​ — ​ ​ (146) ​ 235,145 ​ Total ​ $ 363,502 ​ $ 10 ​ $ — ​ $ (650) ​ $ 362,862 ​

DERIVATIVES (Tables)

DERIVATIVES (Tables)	3 Months Ended
	Mar. 31, 2021
DERIVATIVES [ABSTRACT]
Schedule of Cash Flow Hedges OCI Rollforward	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ ​ ​ 2021 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Aggregate unrealized net gain/(loss) at beginning of period ​ $ 8,431 ​ $ 4,182 ​ ​ Add: Net gain/(loss) from change in fair value of cash flow hedges ​ ​ (3,773) ​ ​ (7,913) ​ ​ Less: Net (gain)/loss reclassified to earnings from effective hedges ​ ​ 1,059 ​ ​ 110 ​ ​ Aggregate unrealized net gain/(loss) at end of period ​ $ 5,717 ​ $ (3,621) ​ ​
Schedule of Notional Amounts of Outstanding Cash Flow Hedges	The Company’s foreign exchange cash flow hedging instruments as of March 31, 2021 and December 31, 2020 are summarized as follows (amounts in thousands). All hedging instruments are forward contracts. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Local ​ ​ ​ ​ ​ ​ ​ ​ Currency ​ U.S. Dollar ​ ​ % Maturing ​ ​ Contracts ​ ​ Notional ​ Notional ​ ​ in the next ​ ​ Maturing As of March 31, 2021 ​ Amount ​ Amount ​ ​ 12 months ​ ​ Through Canadian Dollar 1,400 ​ $ 1,059 ​ ​ 100 % ​ July 2021 ​ Philippine Peso 5,645,000 ​ 109,143 (1) ​ 58.3 % ​ December 2023 ​ Mexican Peso 1,009,500 ​ 45,454 ​ ​ 56.2 % ​ December 2023 ​ ​ ​ ​ ​ $ 155,656 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Local ​ ​ ​ ​ ​ ​ ​ ​ ​ Currency ​ U.S. Dollar ​ ​ ​ ​ ​ ​ ​ ​ Notional ​ Notional ​ ​ ​ ​ As of December 31, 2020 ​ Amount ​ Amount ​ ​ ​ ​ ​ ​ Canadian Dollar 2,450 ​ $ 1,853 ​ ​ ​ ​ ​ ​ ​ Philippine Peso 6,725,000 ​ 130,468 (1) ​ ​ ​ ​ ​ ​ Mexican Peso 1,159,500 ​ 52,398 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 184,719 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) Includes contracts to purchase Philippine pesos in exchange for New Zealand dollars and Australian dollars, which are translated into equivalent U.S. dollars on March 31, 2021 and December 31, 2020.
Schedule of Derivatives Instruments on Balance Sheet	The Company’s derivatives as of March 31, 2021 and December 31, 2020 were as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ ​ Designated Not Designated ​ ​ as Hedging as Hedging ​ Designation: ​ Instruments Instruments ​ Foreign Foreign Derivative contract type: ​ Exchange ​ Exchange Derivative classification: ​ Cash Flow ​ Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value and location of derivative in the Consolidated Balance Sheet: ​ ​ ​ ​ ​ ​ ​ Prepaids and other current assets ​ $ 5,430 ​ $ 40 ​ Other long-term assets ​ 2,657 ​ — ​ Other current liabilities ​ (156) ​ (106) ​ Other long-term liabilities ​ (206) ​ — ​ Total fair value of derivatives, net ​ $ 7,725 ​ $ (66) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Designated Not Designated ​ ​ as Hedging as Hedging ​ Designation: ​ Instruments Instruments ​ Foreign Foreign Derivative contract type: ​ Exchange ​ Exchange Derivative classification: ​ Cash Flow ​ Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value and location of derivative in the Consolidated Balance Sheet: ​ ​ ​ ​ ​ ​ ​ Prepaids and other current assets ​ $ 6,939 ​ $ 103 ​ Other long-term assets ​ 4,528 ​ — ​ Other current liabilities ​ (73) ​ (118) ​ Other long-term liabilities ​ (4) ​ — ​ Total fair value of derivatives, net ​ $ 11,390 ​ $ (15) ​
Schedule of cash flow hedge impact on Statement of Comprehensive Income	The effects of derivative instruments on the Consolidated Statements of Comprehensive Income (Loss) for the three months ended March 31, 2021 and 2020 were as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2021 ​ 2020 ​ ​ Designated as Hedging Designation: ​ Instruments Derivative contract type: ​ Foreign Exchange Derivative classification: Cash Flow ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount of gain or (loss) recognized in Other comprehensive income (loss) - effective portion, net of tax ​ $ 1,059 ​ $ 110 ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount and location of net gain or (loss) reclassified from Accumulated OCI to income - effective portion: ​ ​ ​ ​ ​ ​ ​ Revenue ​ $ 1,431 ​ $ 151 ​
Schedule of fair value derivative impact on Statement of Comprehensive Income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2021 ​ 2020 Designation: Not Designated as Hedging Instruments ​ Derivative contract type: Foreign Exchange ​ Derivative classification: Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount and location of net gain or (loss) recognized in the Consolidated Statement of Comprehensive Income (Loss): ​ ​ ​ ​ ​ ​ ​ Other income (expense), net $ (337) $ (330) ​

FAIR VALUE (Tables)

FAIR VALUE (Tables)	3 Months Ended
	Mar. 31, 2021
FAIR VALUE [Abstract]
Schedule of Fair Value Derivative Assets and Liabilities	The following is a summary of the Company’s fair value measurements for its net derivative assets (liabilities) as of March 31, 2021 and December 31, 2020 (in thousands): As of March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ Quoted Prices in Significant ​ ​ ​ ​ ​ Active Markets ​ Other ​ Significant ​ ​ ​ ​ ​ for Identical ​ Observable ​ Unobservable ​ ​ ​ ​ ​ Assets ​ Inputs ​ Inputs ​ ​ ​ ​ ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ At Fair Value Cash flow hedges ​ $ — ​ $ 7,725 ​ $ — ​ $ 7,725 ​ Fair value hedges ​ — ​ (66) ​ — ​ (66) ​ Total net derivative asset (liability) ​ $ — ​ $ 7,659 ​ $ — ​ $ 7,659 ​ ​ As of December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ Quoted Prices in Significant ​ ​ ​ ​ ​ Active Markets ​ Other ​ Significant ​ ​ ​ ​ ​ for Identical ​ Observable ​ Unobservable ​ ​ ​ ​ ​ Assets ​ Inputs ​ Inputs ​ ​ ​ ​ ​ (Level 1) ​ (Level 2) ​ (Level 3) ​ At Fair Value Cash flow hedges ​ $ — ​ $ 11,390 ​ $ — ​ $ 11,390 ​ Fair value hedges ​ — ​ (15) ​ — ​ (15) ​ Total net derivative asset (liability) ​ $ — ​ $ 11,375 ​ $ — ​ $ 11,375 ​
Schedule of Fair Value Assets and Liabilities	The following is a summary of the Company’s fair value measurements as of March 31, 2021 and December 31, 2020 (in thousands): ​ As of March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ Quoted Prices in ​ ​ Significant ​ ​ Active Markets for ​ Significant Other ​ Unobservable ​ ​ Identical Assets ​ Observable Inputs ​ Inputs ​ ​ (Level 1) ​ (Level 2) ​ (Level 3) Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative instruments, net ​ $ — ​ $ 7,659 ​ $ — ​ Total assets ​ $ — ​ $ 7,659 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred compensation plan liability ​ $ — ​ $ (25,781) ​ $ — ​ Derivative instruments, net ​ ​ — ​ ​ — ​ ​ — ​ Contingent consideration ​ — ​ — ​ (18,909) ​ Total liabilities ​ $ — ​ $ (25,781) ​ $ (18,909) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Redeemable noncontrolling interest ​ $ — ​ $ — ​ $ (54,674) ​ ​ As of December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ Quoted Prices in ​ ​ Significant ​ ​ Active Markets for ​ Significant Other ​ Unobservable ​ ​ Identical Assets ​ Observable Inputs ​ Inputs ​ ​ (Level 1) ​ (Level 2) ​ (Level 3) Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative instruments, net ​ $ — ​ $ 11,375 ​ $ — ​ Total assets ​ $ — ​ $ 11,375 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred compensation plan liability ​ $ — ​ $ (23,858) ​ $ — ​ Derivative instruments, net ​ — ​ — ​ — ​ Contingent consideration ​ — ​ — ​ (18,032) ​ Total liabilities ​ $ — ​ $ (23,858) ​ $ (18,032) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Redeemable noncontrolling interest ​ $ — ​ $ — ​ $ (52,976) ​
Schedule of Business Acquisitions by Acquisition Contingent Consideration	A rollforward of the activity in the Company’s fair value of the contingent consideration payable is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Imputed ​ ​ ​ ​ December 31, ​ ​ ​ ​ ​ ​ ​ Interest / ​ March 31, ​ ​ 2020 ​ Acquisitions ​ Payments ​ Adjustments ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ VF US ​ $ 14,085 ​ $ — ​ $ — ​ ​ 481 ​ $ 14,566 ​ VF ASEAN ​ 3,947 ​ — ​ — ​ 396 ​ 4,343 ​ Total ​ $ 18,032 ​ $ — ​ $ — ​ $ 877 ​ $ 18,909 ​

RESTRUCTURING CHARGES, INTEGR_2

RESTRUCTURING CHARGES, INTEGRATION CHARGES AND IMPAIRMENT (Tables)	3 Months Ended
	Mar. 31, 2021
RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES [Abstract]
Schedule of Restructuring Liabilities	A summary of the expenses recorded in Restructuring charges, net in the accompanying Consolidated Statements of Comprehensive Income (Loss) for the three months ended March 31, 2021 and 2020, respectively, is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ ​ 2021 2020 Reduction in force ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ $ — $ 207 TTEC Engage ​ — ​ 236 ​ Total ​ $ — $ 443 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ ​ 2021 2020 Facility exit and other charges ​ ​ ​ ​ ​ ​ ​ TTEC Digital ​ $ 8 $ — ​ TTEC Engage ​ 394 ​ 95 ​ Total ​ $ 402 $ 95 ​ ​
Schedule of Restructuring Liability Rollforward	A rollforward of the activity in the Company’s restructuring accrual is as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reduction ​ Facility Exit and ​ ​ ​ ​ ​ in Force ​ Other Charges ​ Total ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance as of December 31, 2020 ​ $ 156 $ 543 $ 699 ​ Expense ​ — ​ ​ 402 ​ 402 ​ Payments ​ — ​ ​ (502) ​ (502) ​ Change due to foreign currency ​ ​ — ​ ​ 1 ​ ​ 1 ​ Change in estimates ​ — ​ ​ — ​ — ​ Balance as of March 31, 2021 ​ $ 156 $ 444 $ 600 ​

LEASES (Tables)

LEASES (Tables)	3 Months Ended
	Mar. 31, 2021
Lease, Cost [Abstract]
Lease, Cost Table	The components of lease expense for the three months ended March 31, 2021 and 2020 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location in Statements of ​ Three Months Ended March 31, ​ Description ​ Comprehensive Income (Loss) 2021 2020 Amortization of ROU assets - finance leases ​ Depreciation and amortization ​ $ 1,804 ​ $ 1,916 ​ Interest on lease liabilities - finance leases ​ Interest expense ​ ​ 40 ​ ​ 56 Operating lease cost (cost resulting from lease payments) ​ Cost of services ​ 10,439 ​ 12,038 ​ Operating lease cost (cost resulting from lease payments) ​ Selling, general and administrative ​ ​ 606 ​ ​ 542 ​ Operating lease cost (cost resulting from lease payments) ​ Restructuring ​ ​ 240 ​ ​ — ​ Operating lease cost (cost resulting from lease payments) ​ Impairment ​ ​ 1,697 ​ ​ — ​ Operating lease cost (cost resulting from lease payments) ​ Other income (expense), net ​ ​ 310 ​ ​ 242 ​ Short-term lease cost ​ Cost of services ​ 966 ​ 997 ​ Variable lease cost (cost excluded from lease payments) ​ Cost of services ​ ​ 318 ​ ​ — ​ Less: Sublease income ​ Selling, general and administrative ​ ​ (228) ​ ​ (182) ​ Less: Sublease income ​ Other income (expense), net ​ (676) ​ (496) ​ Total lease cost ​ ​ ​ $ 15,516 $ 15,113 ​ ​
Schedule of leases	Other supplementary information for the three months ended March 31, 2021 and 2020 are as follows (dollar values in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ ​ 2021 2020 Finance lease - operating cash flows ​ $ 14 ​ $ 19 ​ Finance lease - financing cash flows ​ $ 1,792 ​ $ 2,132 ​ Operating lease - operating cash flows (fixed payments) ​ $ 13,498 ​ $ 14,137 ​ New ROU assets - operating leases ​ $ 3,362 ​ $ 6,548 ​ Modified ROU assets - operating leases ​ $ — ​ $ — ​ New ROU assets - finance leases ​ $ 95 ​ $ 508 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 ​ December 31, 2020 ​ Weighted average remaining lease term - finance leases ​ ​ 2.34 years ​ ​ 2.46 years ​ Weighted average remaining lease term - operating leases ​ ​ 3.60 years ​ ​ 3.73 years ​ Weighted average discount rate - finance leases ​ ​ 1.72% ​ ​ 1.64% ​ Weighted average discount rate - operating leases ​ ​ 6.88% ​ ​ 6.95% ​
Assets and liabilities lessee [Table Text Block]	Operating and financing lease right-of-use assets and lease liabilities within the Consolidated Balance Sheet as of March 31, 2021 and December 31, 2020 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Description Location in Balance Sheet ​ March 31, 2021 ​ December 31, 2020 Assets ​ ​ ​ ​ ​ ​ ​ ​ Operating lease assets Operating lease assets ​ $ 112,129 ​ $ 120,820 ​ Finance lease assets Property, plant and equipment, net ​ 10,947 ​ 12,659 ​ Total leased assets ​ ​ $ 123,076 ​ $ 133,479 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities ​ ​ ​ ​ ​ ​ ​ ​ Current ​ ​ ​ ​ ​ ​ ​ ​ Operating Current operating lease liabilities ​ $ 43,043 ​ $ 43,651 ​ Finance Other current liabilities ​ ​ 5,558 ​ ​ 6,193 ​ Non-current ​ ​ ​ ​ ​ ​ ​ ​ Operating Non-current operating lease liabilities ​ ​ 89,967 ​ ​ 98,277 ​ Finance Other long-term liabilities ​ ​ 3,766 ​ ​ 4,763 ​ Total lease liabilities ​ ​ $ 142,334 ​ $ 152,884 ​ ​
Schedule of future minimum operating lease payments	The future minimum operating lease and finance lease payments required under non-cancelable leases as of March 31, 2021 and December 31, 2020 are as follows (in thousands): March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Sub-lease Finance ​ ​ Leases ​ Income ​ Leases Year 1 ​ $ 49,738 ​ $ (3,500) ​ $ 5,609 ​ Year 2 ​ 45,668 ​ (3,488) ​ 2,150 ​ Year 3 ​ 26,224 ​ (2,947) ​ 1,402 ​ Year 4 ​ 16,167 ​ (2,940) ​ 355 ​ Year 5 ​ 6,467 ​ (2,695) ​ — ​ Thereafter ​ 7,581 ​ — ​ — ​ Total minimum lease payments ​ $ 151,845 ​ $ (15,570) ​ $ 9,516 ​ Less imputed interest ​ ​ (18,835) ​ ​ ​ ​ ​ (192) ​ Total lease liability ​ $ 133,010 ​ ​ ​ ​ $ 9,324 ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Sub-lease Finance ​ ​ Leases ​ Income ​ Leases Year 1 ​ $ 51,120 ​ $ (3,500) ​ $ 6,237 ​ Year 2 ​ 46,913 ​ (3,489) ​ 2,740 ​ Year 3 ​ 31,085 ​ (3,123) ​ 1,631 ​ Year 4 ​ 17,338 ​ (2,905) ​ 579 ​ Year 5 ​ 8,288 ​ (2,940) ​ — ​ Thereafter ​ 8,397 ​ (490) ​ — ​ Total minimum lease payments ​ $ 163,141 ​ $ (16,447) ​ $ 11,187 ​ Less imputed interest ​ ​ (21,213) ​ ​ ​ ​ ​ (231) ​ Total lease liability ​ $ 141,928 ​ ​ ​ ​ $ 10,956 ​
Schedule of future minimum finance lease payments	The future minimum operating lease and finance lease payments required under non-cancelable leases as of March 31, 2021 and December 31, 2020 are as follows (in thousands): March 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Sub-lease Finance ​ ​ Leases ​ Income ​ Leases Year 1 ​ $ 49,738 ​ $ (3,500) ​ $ 5,609 ​ Year 2 ​ 45,668 ​ (3,488) ​ 2,150 ​ Year 3 ​ 26,224 ​ (2,947) ​ 1,402 ​ Year 4 ​ 16,167 ​ (2,940) ​ 355 ​ Year 5 ​ 6,467 ​ (2,695) ​ — ​ Thereafter ​ 7,581 ​ — ​ — ​ Total minimum lease payments ​ $ 151,845 ​ $ (15,570) ​ $ 9,516 ​ Less imputed interest ​ ​ (18,835) ​ ​ ​ ​ ​ (192) ​ Total lease liability ​ $ 133,010 ​ ​ ​ ​ $ 9,324 ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating Sub-lease Finance ​ ​ Leases ​ Income ​ Leases Year 1 ​ $ 51,120 ​ $ (3,500) ​ $ 6,237 ​ Year 2 ​ 46,913 ​ (3,489) ​ 2,740 ​ Year 3 ​ 31,085 ​ (3,123) ​ 1,631 ​ Year 4 ​ 17,338 ​ (2,905) ​ 579 ​ Year 5 ​ 8,288 ​ (2,940) ​ — ​ Thereafter ​ 8,397 ​ (490) ​ — ​ Total minimum lease payments ​ $ 163,141 ​ $ (16,447) ​ $ 11,187 ​ Less imputed interest ​ ​ (21,213) ​ ​ ​ ​ ​ (231) ​ Total lease liability ​ $ 141,928 ​ ​ ​ ​ $ 10,956 ​

OTHER LONG-TERM LIABILITIES (Ta

OTHER LONG-TERM LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2021
Other Liabilities, Noncurrent [Abstract]
Other Noncurrent Liabilities [Table Text Block]	The components of Other long-term liabilities as of March 31, 2021 and December 31, 2020 are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2021 December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred revenue ​ ​ $ 19,203 $ 17,434 ​ Deferred compensation plan ​ ​ ​ 25,781 ​ ​ 23,858 ​ Other ​ ​ 55,170 ​ 54,893 ​ Total ​ ​ $ 100,154 $ 96,185 ​

NONCONTROLLING INTEREST (Tables

NONCONTROLLING INTEREST (Tables)	3 Months Ended
	Mar. 31, 2021
NONCONTROLLING INTEREST [Abstract]
Noncontrolling Interest Rollforward	The following table reconciles equity attributable to noncontrolling interest in the Company’s subsidiary (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ 2021 2020 Noncontrolling interest, January 1 $ 13,060 $ 13,186 ​ Net income attributable to noncontrolling interest ​ 2,908 ​ 2,216 ​ Dividends distributed to noncontrolling interest ​ (2,385) ​ (1,850) ​ Foreign currency translation adjustments ​ 126 ​ (516) ​ Noncontrolling interest, March 31 $ 13,709 $ 13,036 ​

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	3 Months Ended
	Mar. 31, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [ABSTRACT]
Schedule of accumulated other comprehensive income (loss)	The following table presents changes in the accumulated balance for each component of Other comprehensive income (loss), including current period other comprehensive income (loss) and reclassifications out of accumulated other comprehensive income (loss) (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreign ​ ​ ​ ​ ​ ​ ​ ​ Currency ​ Derivative ​ ​ ​ ​ ​ ​ ​ ​ Translation ​ Valuation, Net ​ Other, Net ​ ​ ​ ​ ​ Adjustment ​ of Tax ​ of Tax ​ Totals ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accumulated other comprehensive income (loss) at December 31, 2019 ​ $ (107,480) $ 4,182 $ (2,936) $ (106,234) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive income (loss) before reclassifications ​ (29,298) ​ (7,913) ​ 258 ​ (36,953) ​ Amounts reclassified from accumulated other comprehensive income (loss) ​ — ​ 110 ​ (131) ​ (21) ​ Net current period other comprehensive income (loss) ​ (29,298) ​ (7,803) ​ 127 ​ (36,974) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accumulated other comprehensive income (loss) at March 31, 2020 ​ $ (136,778) $ (3,621) $ (2,809) $ (143,208) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accumulated other comprehensive income (loss) at December 31, 2020 ​ $ (78,139) $ 8,431 $ (2,448) $ (72,156) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other comprehensive income (loss) before reclassifications ​ (5,879) ​ ​ (3,773) ​ ​ 108 ​ (9,544) ​ Amounts reclassified from accumulated other comprehensive income (loss) ​ — ​ ​ 1,059 ​ ​ (72) ​ 987 ​ Net current period other comprehensive income (loss) ​ (5,879) ​ (2,714) ​ 36 ​ (8,557) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accumulated other comprehensive income (loss) at March 31, 2021 ​ $ (84,018) $ 5,717 $ (2,412) $ (80,713) ​
Schedule of reclassifications from Accumulated other comprehensive income (loss)	The following table presents the classification and amount of the reclassifications from Accumulated other comprehensive income (loss) to the Statement of Comprehensive Income (Loss) (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months Ended ​ Statement of ​ ​ ​ March 31, ​ Comprehensive Income ​ ​ 2021 2020 (Loss) Classification ​ Derivative valuation ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain (loss) on foreign currency forward exchange contracts ​ $ 1,431 ​ $ 151 Revenue ​ Tax effect ​ (372) ​ (41) Provision for income taxes ​ ​ ​ $ 1,059 ​ $ 110 Net income (loss) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ Actuarial loss on defined benefit plan ​ $ (80) ​ $ (146) Cost of services ​ Tax effect ​ 8 ​ 15 Provision for income taxes ​ ​ ​ $ (72) ​ $ (131) Net income (loss) ​ ​

WEIGHTED AVERAGE SHARE COUNTS (

WEIGHTED AVERAGE SHARE COUNTS (Tables)	3 Months Ended
	Mar. 31, 2021
Weighted Average Share Counts
Schedule of Diluted Shares Calculation	The following table sets forth the computation of basic and diluted shares for the periods indicated (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, ​ 2021 2020 ​ ​ ​ ​ ​ ​ Shares used in basic earnings per share calculation ​ 46,743 46,498 Effect of dilutive securities: ​ ​ ​ ​ ​ Restricted stock units ​ 612 315 Performance-based restricted stock units ​ — — Total effects of dilutive securities ​ 612 315 Shares used in dilutive earnings per share calculation ​ 47,355 46,813

OVERVIEW AND BASIS OF PRESENT_3

OVERVIEW AND BASIS OF PRESENTATION (TABLES) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 144,213	$ 132,914
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	160,236	159,015	$ 542,005	$ 105,591
Prepaid Expenses and Other Current Assets [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 16,023	$ 26,101

OVERVIEW AND BASIS OF PRESENT_4

OVERVIEW AND BASIS OF PRESENTATION (NARRATIVE) (Details)	Mar. 31, 2021USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of employees	58,500
Percepta LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
ownership percentage	55.00%
FCR
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
ownership percentage	70.00%
Serendebyte
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
ownership percentage	70.00%

ACQUISITIONS ASSETS ACQUIRED (T

ACQUISITIONS ASSETS ACQUIRED (TABLES) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Nov. 04, 2020	Aug. 05, 2020	Feb. 07, 2020
Business Acquisition [Line Items]
Operating lease assets	$ 112,129	$ 120,820
Goodwill	362,862	363,502
Operating lease liability - short-term	43,043	43,651
Accrued employee compensation and benefits	161,792	163,658
Operating lease liability - long-term	$ 89,967	$ 98,277
Voice Foundry US
Business Acquisition [Line Items]
Accounts receivable.				$ 3,758
Prepaid Expenses				345
Goodwill				35,881
Total assets acquired				47,084
Accounts payable				289
Accrued employee compensation and benefits				741
Deferred revenue.				170
Total liabilities assumed				1,200
Total purchase price				45,884
Voice Foundry US | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets				400
Voice Foundry US | Noncompete Agreements [Member]
Business Acquisition [Line Items]
Intangible assets				150
Voice Foundry US | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets				$ 6,550
Voice Foundry ASEAN
Business Acquisition [Line Items]
Cash			$ 1,300
Accounts receivable.			937
Prepaid Expenses			115
Property, plant and equipment.			274
Income Taxes Receivable			30
Goodwill			14,418
Total assets acquired			20,474
Accounts payable			960
Accrued employee compensation and benefits			113
Deferred tax liabilities			1,013
Deferred revenue.			236
Other accrued assets liabilities, net			(78)
Total liabilities assumed			2,244
Total purchase price			18,230
Voice Foundry ASEAN | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets			300
Voice Foundry ASEAN | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets			$ 3,100
Serendebyte
Business Acquisition [Line Items]
Cash					$ 3,123
Accounts receivable.					1,243
Prepaid Expenses					1,327
Property, plant and equipment.					20
Deferred tax assets.					14
Goodwill					9,033
Total assets acquired					17,080
Accounts payable					120
Accrued employee compensation and benefits					1,025
Accrued income taxes					170
Accrued expenses					2,208
Deferred tax liabilities					629
Total liabilities assumed					4,152
Total purchase price					12,928
Serendebyte | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets					400
Serendebyte | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets					$ 1,920

ACQUISITIONS AND DIVESTITURES_2

ACQUISITIONS AND DIVESTITURES (NARRATIVE) (Details)	Apr. 08, 2021USD ($)	Nov. 04, 2020USD ($)	Aug. 05, 2020USD ($)	Feb. 07, 2020USD ($)	Apr. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Business Acquisition [Line Items]
Entity Number of Employees						58,500
Other liabilities, noncurrent						$ 100,154,000	$ 96,185,000
Redeemable noncontrolling interest						54,674,000	52,976,000		$ 53,367,000	$ 48,923,000
Contingent Consideration, at fair value						18,909,000	18,032,000
Business Combination Contingent Consideration Liability						18,909,000	18,032,000
Revenue of Acquirees since Acquisition Date, Actual						11,600,000
Income (loss) from operations of Acquirees since Acquisition Date, Actual						1,000,000
Acquired intangible amortization of acquirees since acquisition						800,000
Sales Revenue Services Net						539,219,000			432,213,000
Net income attributable to TTEC stockholders						50,418,000			21,534,000
Business Acquisition, Pro Forma Revenue									438,000,000
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax									23,000,000
Foreign Subsidiary 1 [Member]
Business Acquisition [Line Items]
(Gain) Loss on dissolution of subsidiary								$ 2,500,000
Foreign Subsidiary 2 [Member]
Business Acquisition [Line Items]
(Gain) Loss on dissolution of subsidiary						17,400,000
TTEC Digital
Business Acquisition [Line Items]
Sales Revenue Services Net						63,587,000			77,556,000
TTEC Engage
Business Acquisition [Line Items]
Sales Revenue Services Net						$ 475,632,000			$ 354,657,000
Voice Foundry ASEAN
Business Acquisition [Line Items]
ownership percentage		100.00%
Serendebyte
Business Acquisition [Line Items]
ownership percentage						70.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners				30.00%
Avtex
Business Acquisition [Line Items]
ownership percentage	100.00%
Voice Foundry US
Business Acquisition [Line Items]
Date of Acquisition			Aug. 5, 2020
Description of Acquired Entity			Voice Foundry is a preferred Amazon Connect cloud contact center service and implementation partner
Entity Number of Employees			60
Payments to Acquire Businesses			$ 34,300,000
Total purchase price			45,884,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities						$ 300,000
Future Value of Liabilities Incurred From Business Acquisitions			$ 7,400,000			10,900,000
Contingent Consideration, at fair value						14,566,000	14,085,000
Business Combination Contingent Consideration Liability						14,566,000	14,085,000
Increase (decrease) in contingent consideration payable					$ (7,400,000)	$ (500,000)	(3,200,000)
Voice Foundry US | Risk Free Interest Rate
Business Acquisition [Line Items]
Business combination contingent consideration measurement input			2.6
Voice Foundry US | Expected forecast volatility rate [Member]
Business Acquisition [Line Items]
Business combination contingent consideration measurement input			47
Voice Foundry US | Discount Rate
Business Acquisition [Line Items]
Business combination contingent consideration measurement input			23.1			23.1
Voice Foundry US | Other accrued expenses
Business Acquisition [Line Items]
Contingent Consideration, at fair value						$ 7,400,000
Business Combination Contingent Consideration Liability						7,400,000
Voice Foundry US | Other Noncurrent Liabilities [Member]
Business Acquisition [Line Items]
Contingent Consideration, at fair value						7,200,000
Business Combination Contingent Consideration Liability						7,200,000
Voice Foundry US | Customer Relationships [Member]
Business Acquisition [Line Items]
Useful life			4 years
Voice Foundry US | Trade Names [Member]
Business Acquisition [Line Items]
Useful life			2 years
Voice Foundry US | Voice Foundry US
Business Acquisition [Line Items]
ownership percentage			100.00%
Voice Foundry ASEAN
Business Acquisition [Line Items]
Date of Acquisition		Nov. 4, 2020
Payments to Acquire Businesses		$ 15,200,000
Total purchase price		18,230,000
Future Value of Liabilities Incurred From Business Acquisitions		2,800,000
Contingent Consideration, at fair value						4,343,000	3,947,000
Business Combination Contingent Consideration Liability						4,343,000	3,947,000
Increase (decrease) in contingent consideration payable					$ 2,200,000	$ (400,000)	$ (1,200,000)
Voice Foundry ASEAN | Maximum
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		$ 2,200,000
Voice Foundry ASEAN | Risk Free Interest Rate
Business Acquisition [Line Items]
Business combination contingent consideration measurement input		1.6
Voice Foundry ASEAN | Expected forecast volatility rate [Member]
Business Acquisition [Line Items]
Business combination contingent consideration measurement input		50
Voice Foundry ASEAN | Discount Rate
Business Acquisition [Line Items]
Business combination contingent consideration measurement input		18.4				18.4
Voice Foundry ASEAN | Other accrued expenses
Business Acquisition [Line Items]
Contingent Consideration, at fair value						$ 2,200,000
Business Combination Contingent Consideration Liability						2,200,000
Voice Foundry ASEAN | Other Noncurrent Liabilities [Member]
Business Acquisition [Line Items]
Contingent Consideration, at fair value						2,100,000
Business Combination Contingent Consideration Liability						2,100,000
Voice Foundry ASEAN | Customer Relationships [Member]
Business Acquisition [Line Items]
Useful life		4 years
Voice Foundry ASEAN | Trade Names [Member]
Business Acquisition [Line Items]
Useful life		2 years
Serendebyte
Business Acquisition [Line Items]
Date of Acquisition				Feb. 7, 2020
Percentage of Voting Interests Acquired				70.00%
Description of Acquired Entity				Serendebyte Inc., a Delaware corporation (“the Serendebyte Transaction”). Serendebyte is an autonomous customer experience and intelligent automation solutions provider with 125 employees based in India, the United States, and Canada
Entity Number of Employees				125
Total purchase price				$ 12,928,000
Cash balance retained				2,200,000
Redeemable noncontrolling interest				$ 3,800,000
Serendebyte | Discount Rate
Business Acquisition [Line Items]
Unobservable Measurement Input, Uncertainty, Description				35%
Serendebyte | TTEC Digital
Business Acquisition [Line Items]
Percentage of Voting Interests Acquired				70.00%
Payments to Acquire Businesses				$ 9,000,000		$ 800,000
Serendebyte | Customer Relationships [Member]
Business Acquisition [Line Items]
Useful life				5 years
Serendebyte | Trade Names [Member]
Business Acquisition [Line Items]
Useful life				3 years
Avtex
Business Acquisition [Line Items]
Date of Acquisition	Apr. 8, 2021
Description of Acquired Entity	100% of the outstanding stock of Avtex Solutions, Holdings LLC (“Avtex”). Avtex is an end-to-end customer experience and CXaaS solutions provider with offerings in Genesys and Microsoft cloud solutions
Payments to Acquire Businesses	$ 490,000,000

SEGMENT INFORMATION (SEGMENT FI

SEGMENT INFORMATION (SEGMENT FINANCIALS) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net Revenue	$ 539,219	$ 432,213
Depreciation and amortization	20,459	18,872
Income (Loss) from Operations	73,424	40,716
Capital Expenditures	11,565	16,813
Total Assets	1,495,653		$ 1,516,408
Goodwill	362,862		363,502
Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	539,241	432,438
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	(22)	(225)
TTEC Digital
Segment Reporting Information [Line Items]
Net Revenue	63,587	77,556
Depreciation and amortization	3,887	3,288
Income (Loss) from Operations	4,202	10,258
Capital Expenditures	1,532	2,438
Total Assets	268,063		277,365
Goodwill	127,717		128,211
TTEC Digital | Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	63,609	77,781
TTEC Digital | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	(22)	(225)
TTEC Engage
Segment Reporting Information [Line Items]
Net Revenue	475,632	354,657
Depreciation and amortization	16,572	15,584
Income (Loss) from Operations	69,222	30,458
Capital Expenditures	10,033	14,375
Total Assets	1,227,590		1,239,043
Goodwill	235,145		$ 235,291
TTEC Engage | Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	$ 475,632	$ 354,657

SEGMENT INFORMATION (REVENUE GE

SEGMENT INFORMATION (REVENUE GEOGRAPHY) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue Services Net	$ 539,219	$ 432,213
Other long-term assets	65,048		$ 69,438
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue Services Net	358,326	277,676
Philippines [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue Services Net	102,252	91,105
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue Services Net	29,439	25,098
Europe Middle East Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue Services Net	25,917	16,944
Asia Pacific India[ Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue Services Net	16,167	15,168
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales Revenue Services Net	$ 7,118	$ 6,222

ACCOUNTS RECEIVABLE (SCHEDULE O

ACCOUNTS RECEIVABLE (SCHEDULE OF CHANGE IN ALLOWANCE) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract]
Balance, beginning of year	$ 5,067	$ 5,452
Provision for credit losses	21	162
Uncollectible receivables written-off	(83)	(208)
Effect of foreign currency	(8)	(4)
Balance, end of year	$ 4,997	$ 5,402

ACCOUNTS RECEIVABLE AND SIGNI_2

ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS(NARRATIVE) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2018
Entity Wide Revenue Major Customer Line Items
Concentration Risk, Customer		zero
Revenue.	$ 539,219	$ 432,213
Financial Services Client
Entity Wide Revenue Major Customer Line Items
Concentration risk percentage	15.70%	2.90%
Sears
Entity Wide Revenue Major Customer Line Items
Accounts receivable amount from major customer	$ 2,700		$ 2,700
Revenue | Customer Concentration Risk | Minimum
Entity Wide Revenue Major Customer Line Items
Revenue.	$ 100,000
Revenue | Customer Concentration Risk | Financial Services Client
Entity Wide Revenue Major Customer Line Items
Concentration Risk, Customer	one

Receivables Sales Agreement - A

Receivables Sales Agreement - Additional Information (Narrative) (Detail) $ in Millions	Mar. 31, 2021USD ($)
Receivables Sales Agreement [Line Items]
Factored Accounts Receivable, net	$ 72
Cash from customers not yet remitted	16
Proceeds from factored receivables	75
Maximum
Receivables Sales Agreement [Line Items]
Proceeds from factored receivables	$ 75

GOODWILL (GOODWILL ROLLFORWARD)

GOODWILL (GOODWILL ROLLFORWARD) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Goodwill [Line Items]
Beginning balance, goodwill	$ 363,502
Acquisitions / Adjustments Increase (Decrease)	10
Effect of Foreign Currency	(650)
Ending balance, goodwill	362,862
TTEC Digital
Goodwill [Line Items]
Beginning balance, goodwill	128,211
Acquisitions / Adjustments Increase (Decrease)	10
Effect of Foreign Currency	(504)
Ending balance, goodwill	127,717
TTEC Engage
Goodwill [Line Items]
Beginning balance, goodwill	235,291
Effect of Foreign Currency	(146)
Ending balance, goodwill	$ 235,145

DERIVATIVES (OCI ROLLFORWARD) (

DERIVATIVES (OCI ROLLFORWARD) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
DERIVATIVES [ABSTRACT]
Aggregate unrealized net gain/(loss) at beginning of year	$ 8,431	$ 4,182
Add: Net gain/(loss) from change in fair value of cash flow hedges	(3,773)	(7,913)
Less: Net (gain)/loss reclassified to earnings from effective hedges	1,059	110
Aggregate unrealized net gain/(loss) at end of period	$ 5,717	$ (3,621)

DERIVATIVES (NOTIONAL TABLE) (D

DERIVATIVES (NOTIONAL TABLE) (Details) ₱ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Mar. 31, 2021CAD ($)	Mar. 31, 2021USD ($)	Mar. 31, 2021PHP (₱)	Mar. 31, 2021MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2020PHP (₱)	Dec. 31, 2020MXN ($)
Derivative [Line Items]
Notional Amount		$ 27,800			$ 35,500
CAD
Derivative [Line Items]
Contract Maturity Date	Jul. 1, 2021
PHP
Derivative [Line Items]
Contract Maturity Date	Jul. 1, 2023
MXN
Derivative [Line Items]
Contract Maturity Date	Jul. 1, 2023
Foreign Exchange Forward
Derivative [Line Items]
Notional Amount		155,656			184,719
Foreign Exchange Forward | CAD
Derivative [Line Items]
Notional Amount	$ 1,400	$ 1,059
% Maturing in the Next 12 Months	100.00%	100.00%	100.00%	100.00%
Foreign Exchange Forward | PHP
Derivative [Line Items]
Notional Amount		$ 109,143	₱ 5,645,000		130,468	₱ 6,725,000
% Maturing in the Next 12 Months	58.30%	58.30%	58.30%	58.30%
Foreign Exchange Forward | MXN
Derivative [Line Items]
Notional Amount		$ 45,454		$ 1,009,500	$ 52,398		$ 1,159,500
% Maturing in the Next 12 Months	56.20%	56.20%	56.20%	56.20%

DERIVATIVES (BALANCE SHEET CLAS

DERIVATIVES (BALANCE SHEET CLASSIFICATION) (Details) - Foreign Exchange [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Designated as Hedging Instruments [Member] | Cash Flow [Member]
Derivatives, Fair Value [Line Items]
Total net derivative asset (liability)	$ 7,725	$ 11,390
Designated as Hedging Instruments [Member] | Cash Flow [Member] | Prepaids And Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total net derivative asset (liability)	5,430	6,939
Designated as Hedging Instruments [Member] | Cash Flow [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Total net derivative asset (liability)	2,657	4,528
Designated as Hedging Instruments [Member] | Cash Flow [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total net derivative asset (liability)	(156)	(73)
Designated as Hedging Instruments [Member] | Cash Flow [Member] | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Total net derivative asset (liability)	(206)	(4)
Not Designated as Hedging Instruments [Member] | Fair Value [Member]
Derivatives, Fair Value [Line Items]
Total net derivative asset (liability)	(66)	(15)
Not Designated as Hedging Instruments [Member] | Fair Value [Member] | Prepaids And Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total net derivative asset (liability)	40	103
Not Designated as Hedging Instruments [Member] | Fair Value [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total net derivative asset (liability)	$ (106)	$ (118)

DERIVATIVES (INCOME STATEMENT C

DERIVATIVES (INCOME STATEMENT CLASSIFICATION) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Sales Revenue Services Net	$ 539,219	$ 432,213
Other nonoperating income expense	(798)	3,396
Designated as Hedging Instruments [Member] | Foreign Exchange [Member] | Cash Flow [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in other comprehensive income (loss) - effective portion, net of tax:	1,059	110
Designated as Hedging Instruments [Member] | Foreign Exchange [Member] | Cash Flow [Member] | Reclassification from accumulated other comprehensive income | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Sales Revenue Services Net	1,431	151
Not Designated as Hedging Instruments [Member] | Foreign Exchange [Member] | Fair Value [Member] | Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Other nonoperating income expense	$ (337)	$ (330)

DERIVATIVES (NARRATIVE) (Detail

DERIVATIVES (NARRATIVE) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
DERIVATIVES [ABSTRACT]
Notional Amount	$ 27.8	$ 35.5

FAIR VALUE (DERIVATIVES TABLE)

FAIR VALUE (DERIVATIVES TABLE) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Net Derivative Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash flow hedges	$ 0	$ 0
Fair value hedges	0	0
Total net derivative asset (liability)	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Net Derivative Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash flow hedges	7,725	11,390
Fair value hedges	(66)	(15)
Total net derivative asset (liability)	7,659	11,375
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Net Derivative Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash flow hedges	0	0
Fair value hedges	0	0
Total net derivative asset (liability)	0	0
Fair Value, Measurements, Recurring [Member]
Fair Value Net Derivative Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash flow hedges	7,725	11,390
Fair value hedges	(66)	(15)
Total net derivative asset (liability)	$ 7,659	$ 11,375

FAIR VALUE (FAIR VALUE ASSETS A

FAIR VALUE (FAIR VALUE ASSETS AND LIABILITIES) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Liabilities [Abstract]
Contingent consideration	$ (18,909)	$ (18,032)
Redeemable noncontrolling interest	(54,674)	(52,976)	$ (53,367)	$ (48,923)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Derivative assets, net	0
Total assets	0
Liabilities [Abstract]
Deferred compensation plan liability	0
Derivative instruments, net	0
Contingent consideration	0
Total liabilities	0
Redeemable noncontrolling interest	0
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Derivative assets, net	7,659	11,375
Total assets	7,659	11,375
Liabilities [Abstract]
Deferred compensation plan liability	(25,781)	(23,858)
Derivative instruments, net	0
Contingent consideration	0
Total liabilities	(25,781)	(23,858)
Redeemable noncontrolling interest	0
Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Derivative assets, net	0
Total assets	0
Liabilities [Abstract]
Deferred compensation plan liability	0
Derivative instruments, net	0
Contingent consideration	(18,909)	(18,032)
Total liabilities	(18,909)	(18,032)
Redeemable noncontrolling interest	$ (54,674)	$ (52,976)

FAIR VALUE (CONTINGENT CONSIDER

FAIR VALUE (CONTINGENT CONSIDERATION TABLE) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Business acquisitions, Contingent Consideration [Line Items]
Beginning balance, contingent consideration payable	$ 18,032
Acquisitions	0
Payments	0
Imputed Interest/ Adjustment	877
Ending balance, contingent consideration payable	18,909
Voice Foundry US
Business acquisitions, Contingent Consideration [Line Items]
Beginning balance, contingent consideration payable	14,085
Acquisitions	0
Payments	0
Imputed Interest/ Adjustment	481
Ending balance, contingent consideration payable	14,566
Voice Foundry ASEAN
Business acquisitions, Contingent Consideration [Line Items]
Beginning balance, contingent consideration payable	3,947
Acquisitions	0
Payments	0
Imputed Interest/ Adjustment	396
Ending balance, contingent consideration payable	$ 4,343

FAIR VALUE (NARRATIVE) (Details

FAIR VALUE (NARRATIVE) (Details) $ in Thousands	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Apr. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Nov. 04, 2020	Aug. 05, 2020
Business acquisitions, Contingent Consideration [Line Items]
Line of credit	$ 339,000	$ 385,000				$ 339,000	$ 385,000
Average interest rate on annual borrowings						1.10%
Purchase Price Payable Payments During Period						$ 0
Business Combination Contingent Consideration Liability	18,909	18,032				18,909	18,032
FCR
Business acquisitions, Contingent Consideration [Line Items]
Increase (decrease) in contingent consideration payable			$ 1,100	$ 3,300
Voice Foundry US
Business acquisitions, Contingent Consideration [Line Items]
Purchase Price Payable Payments During Period						0
Business Combination Contingent Consideration Liability	$ 14,566	14,085				14,566	14,085
Increase (decrease) in contingent consideration payable					$ (7,400)	$ (500)	(3,200)
Voice Foundry US | Discount Rate
Business acquisitions, Contingent Consideration [Line Items]
Business combination contingent consideration measurement input	23.1					23.1			23.1
Voice Foundry ASEAN
Business acquisitions, Contingent Consideration [Line Items]
Purchase Price Payable Payments During Period						$ 0
Business Combination Contingent Consideration Liability	$ 4,343	3,947				4,343	3,947
Increase (decrease) in contingent consideration payable					$ 2,200	$ (400)	$ (1,200)
Voice Foundry ASEAN | Discount Rate
Business acquisitions, Contingent Consideration [Line Items]
Business combination contingent consideration measurement input	18.4					18.4		18.4
Voice Foundry Acquisitions
Business acquisitions, Contingent Consideration [Line Items]
Business Combination Contingent Consideration Liability	$ 18,900					$ 18,900
Increase (decrease) in contingent consideration payable	$ 900	$ 4,300
CafeX [Member]
Business acquisitions, Contingent Consideration [Line Items]
Impairment of equity investment						$ 15,600

INCOME TAXES (NARRATIVE) (Detai

INCOME TAXES (NARRATIVE) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Income Tax Narrative [Line Items]
Net Change in Valuation Allowance	$ 2.4	$ 0.9	$ 0.3
Deferred tax assets, gross	15.5
Valuation allowance on deferred tax assets	20.3
Deferred tax assets, net of valuation allowance and deferred tax liabilities	9.1
Deferred Tax Liabilities, Net	$ 6.4
Effective income tax rate	22.50%		29.20%
Tax Adjustments, Settlements, and Unusual Provisions	$ 1.7
Income Tax Holidays Description	The Company has been granted “Tax Holidays” as an incentive to attract foreign investment by the government of the Philippines. Generally, a Tax Holiday is an agreement between the Company and a foreign government under which the Company receives certain tax benefits in that country, such as exemption from taxation on profits derived from export-related activities. In the Philippines, the Company has been granted multiple agreements with an initial period of four years and additional periods for varying years, expiring at various times between 2021 and 2022.
Income Tax Holiday Termination Date	2021 and 2022
Aggregate effect on income tax expense for income tax holiday jurisdictions	$ 1.1		$ 1.4
Diluted net income per share effect for income tax holiday jurisdictions	$ 0.02		$ 0.03
United States [Member]
Income Tax Narrative [Line Items]
Income Tax Years under Audit	2017 and 2018
Income Tax Examination, Description	The Company’s U.S. income tax returns filed for the tax years ending December 31, 2017 to present, remain open tax years
Philippines [Member]
Income Tax Narrative [Line Items]
Income Tax Years under Audit	2017 and 2018

RESTRUCTURING AND INTEGRATION C

RESTRUCTURING AND INTEGRATION CHARGES AND IMPAIRMENT LOSSES (LIABILITY CLASSIFICATION TABLE) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Reduction in force		$ 443
Facility exit charges	$ 402	95
Restructuring charges, net	402	538
TTEC Digital
Restructuring Cost and Reserve [Line Items]
Reduction in force		207
Facility exit charges	8
TTEC Engage
Restructuring Cost and Reserve [Line Items]
Reduction in force		236
Facility exit charges	$ 394	$ 95

RESTRUCTURING CHARGES AND IMPAI

RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES (LIABILITY ROLLFORWARD TABLE) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning balance, restructuring reserve	$ 699
Expense	402
Payments	(502)
Ending balance, restructuring reserve	600
Reduction in Force [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, restructuring reserve	156
Ending balance, restructuring reserve	156
Closure of Delivery Centers [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, restructuring reserve	543
Expense	402
Payments	(502)
Ending balance, restructuring reserve	$ 444

RESTRUCTURING AND INTEGRATION_2

RESTRUCTURING AND INTEGRATION CHARGES AND IMPAIRMENT LOSSES (NARRATIVE) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Reduction in force					$ 443
Restructuring Reserve, Period Increase (Decrease)	$ 300
Facility exit charges	402				95
Restructuring reserve decrease
Restructuring Reserve, Period Increase (Decrease)	100
Leasehold Improvements
Restructuring impairment losses					700
TTEC Digital
Reduction in force					207
Facility exit charges	8
TTEC Engage
Reduction in force					236
Facility exit charges	394				$ 95
TTEC Engage | Leasehold Improvements
Restructuring impairment losses	$ 2,400
Cost of Services
Restructuring Reserve, Period Increase (Decrease)		$ 300		$ 3,000
Cost of Services | Restructuring reserve decrease
Restructuring Reserve, Period Increase (Decrease)			$ (1,600)

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (NARRATIVE) (Details)	Mar. 31, 2021USD ($)	Mar. 25, 2021USD ($)	Apr. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)
Line of Credit Facility, Expiration Date				Feb. 14, 2024
Line of Credit Facility, Increase (Decrease), Other, Net		$ 300,000,000
Line of Credit Facility, Current Borrowing Capacity		$ 1,200,000,000
Initial Borrowing Capacity	$ 1,200,000			$ 1,200,000
Proceeds from factored receivables	75,000,000			75,000,000
Percentage of receivables factored	25			$ 25
Credit facility interest rate				1.10%
Line of Credit Facility, Collateral				Letter of credit fees are one eighth of 1% of the stated amount of the letter of credit on the date of issuance, renewal or amendment, plus an annual fee equal to the borrowing margin for Eurodollar loans.
Borrowings outstanding on credit facility	339,000,000			$ 339,000,000		$ 385,000,000
Line of credit	339,000,000			339,000,000		$ 385,000,000
Average daily utilization under credit facility				446,100,000	$ 397,700,000
Remaining borrowing capacity under credit facility	855,000,000			855,000,000
Letters Of Credit Issued Outside Line Of Credit Facility	500,000			500,000
Line Of Credit Facility Letters Of Credit Issued	$ 2,800,000			$ 2,800,000
Line of Credit [Member]
Debt Instrument, Increase (Decrease), Net			$ 500,000,000
Fed Funds Effective Rate Overnight Index Swap Rate [Member]
Credit facility interest rate	0.50%
London Interbank Offered Rate (LIBOR) [Member]
Credit facility interest rate	1.25%
Minimum | Interest coverage ration [Member]
Ratio of Indebtedness to Net Capital	2.50			2.50
Minimum | Company's net leverage ratio [Member]
Credit facility interest rate	0.00%
Minimum | Eurodollar [Member]
Credit facility interest rate	1.00%
Maximum
Ratio of Indebtedness to Net Capital	3.50			3.50
Proceeds from factored receivables	$ 75,000,000			$ 75,000,000
Maximum | Company's net leverage ratio [Member]
Credit facility interest rate	0.875%
Maximum | Eurodollar [Member]
Credit facility interest rate	1.875%

LEASE COST (Details)

LEASE COST (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Lease Cost Table Line Items
Total lease cost	$ 15,516	$ 15,113
Depreciation and Amortization
Lease Cost Table Line Items
Amortization of ROU assets - finance leases	1,804	1,916
Interest Expense
Lease Cost Table Line Items
Interest on lease liabilities - finance leases	40	56
Cost of Services
Lease Cost Table Line Items
Operating lease cost (cost resulting from lease payments)	10,439	12,038
Short-term Lease, Cost	966	997
Variable Lease, Cost	(318)
Selling General And Administrative Expenses
Lease Cost Table Line Items
Operating lease cost (cost resulting from lease payments)	606	542
Sublease Income	(228)	(182)
Restructuring
Lease Cost Table Line Items
Operating lease cost (cost resulting from lease payments)	240
Impairment
Lease Cost Table Line Items
Operating lease cost (cost resulting from lease payments)	1,697
Other income (expense), net
Lease Cost Table Line Items
Operating lease cost (cost resulting from lease payments)	310	242
Sublease Income	$ (676)	$ (496)

LEASES OTHER INFORMATION (Detai

LEASES OTHER INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finance lease - operating cash flows	$ 14	$ 19
Finance lease - financing cash flows	1,792	2,132
New ROU assets - operating leases	3,362	6,548
New ROU assets - finance leases	95	508
Fixed payments
Operating Lease, Payments	$ 13,498	$ 14,137

LEASE TERM AND DISCOUNT RATE (D

LEASE TERM AND DISCOUNT RATE (Details)	Mar. 31, 2021	Dec. 31, 2020
LEASES [ABSTRACT]
Finance Lease, Weighted Average Remaining Lease Term	2 years 4 months 7 days	2 years 5 months 18 days
Operating Lease, Weighted Average Remaining Lease Term	3 years 7 months 1 day	3 years 8 months 27 days
Finance Lease, Weighted Average Discount Rate, Percent	1.72%	1.64%
Operating Lease, Weighted Average Discount Rate, Percent	6.88%	6.95%

LEASE ASSETS AND LIABILITIES (D

LEASE ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS.
Operating lease assets	$ 112,129	$ 120,820
Operating Lease Assets Balance Sheet Location	Operating lease assets	Operating lease assets
Finance lease assets	$ 10,947	$ 12,659
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet	us-gaap:PropertyPlantAndEquipmentNet
Total leased assets	$ 123,076	$ 133,479
Current
Operating Lease, Liability, Current	$ 43,043	$ 43,651
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Operating Lease, Liability, Current	Operating Lease, Liability, Current
Finance Lease, Liability, Current	$ 5,558	$ 6,193
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities	Other current liabilities
Non-current
Operating Lease, Liability, Noncurrent	$ 89,967	$ 98,277
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Operating Lease, Liability, Noncurrent	Operating Lease, Liability, Noncurrent
Finance Lease, Liability, Noncurrent	$ 3,766	$ 4,763
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other liabilities, noncurrent	Other liabilities, noncurrent
Total lease liabilities	$ 142,334	$ 152,884

LEASE (FUTURE MINIMUM LEASE PAY

LEASE (FUTURE MINIMUM LEASE PAYMENTS TABLE) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Finance Leases - Year 1		$ 6,237
Finance Leases - Year 2		2,740
Finance Leases - Year 3		1,631
Finance Leases - Year 4		579
Total minimum lease payments	$ 9,516	11,187
Less: imputed interest	(192)	(231)
Total lease liability	9,324	10,956
Finance leases - rolling Year 1	5,609
Finance leases - rolling Year 2	2,150
Finance leases - rolling Year 3	1,402
Finance leases - rolling Year 4	355
Finance Lease, Liability	9,324	10,956
Operating Leases [Member]
Lessee, Lease, Description [Line Items]
Operating Leases - Year 1		51,120
Operating Leases - Year 2		46,913
Operating Leases - Year 3		31,085
Operating Leases - Year 4		17,338
Operating Leases - Year 5		8,288
Thereafter		8,397
Total minimum lease payments	151,845	163,141
Less: Imputed Interest.	(18,835)	(21,213)
Total lease liability	133,010	141,928
Operating leases - rolling Year 1	49,738
Operating leases - rolling Year 2	45,668
Operating leases - rolling Year 3	26,224
Operating leases - rolling Year 4	16,167
Operating leases - rolling Year 5	6,467
Operating leases - rolling Thereafter	7,581
Sublease Income [Member]
Lessee, Lease, Description [Line Items]
Sub-lease income - Year 1		(3,500)
Sub-lease income - Year 2		(3,489)
Sub-lease income - Year 3		(3,123)
Sub-lease income - Year 4		(2,905)
Sub-lease income - Year 5		(2,940)
Sub-lease income - thereafter		(490)
Sublease Income Total	15,570	(16,447)
Sub-lease income - rolling Year 1	(3,500)
Sub-lease income - rolling Year 2	(3,488)
Sub-lease income - rolling Year 3	(2,947)
Sub-lease income - rolling Year 4	(2,940)
Sub-lease income - rolling Year 5	(2,695)
Sublease Income Total	$ (15,570)	$ 16,447

LEASE (NARRATIVE) (Details)

LEASE (NARRATIVE) (Details)	3 Months Ended
	Mar. 31, 2021
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Sub-lease A [Member]
Lease start date	Jan. 1, 2009
Lease Expiration Date	Dec. 31, 2026
Sub-lease B [Member]
Lease start date	Nov. 6, 2017
Lease Expiration Date	May 31, 2021
Sub-lease C [Member]
Lease start date	Mar. 1, 2019
Lease Expiration Date	Jul. 31, 2023
Sub-lease D [Member]
Lease start date	Feb. 6, 2020
Lease Expiration Date	Jun. 14, 2023
Minimum
Lessee, Operating Lease, Term of Contract	1 year
Maximum
Lessee, Operating Lease, Term of Contract	10 years

OTHER LONG TERM LIABILITIES (De

OTHER LONG TERM LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other Liabilities, Noncurrent [Abstract]
Deferred revenue - long-term	$ 19,203	$ 17,434
Deferred Compensation Liability, Classified, Noncurrent	25,781	23,858
Other Accrued Liabilities, Noncurrent	55,170	54,893
Other Liabilities, Noncurrent, Total	$ 100,154	$ 96,185

NONCONTROLLING INTEREST (NONCON

NONCONTROLLING INTEREST (NONCONTROLLING INTEREST ROLLFORWARD TABLE) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stockholders' Equity Attributable to Noncontrolling Interest
Noncontrolling interest, Beginning of period	$ 13,060	$ 13,186
Net income attributable to noncontrolling interest	2,908	2,216
Dividends distributed to noncontrolling interest	(2,385)	(1,850)
Foreign currency translation adjustments	126	(516)
Noncontrolling interest, End of period	$ 13,709	$ 13,036

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (ROLLFORWARD TABLE) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, value	$ 457,762	$ 431,730
Ending balance, value	480,241	401,406
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, value	(72,156)	(106,234)
Other comprehensive income (loss) before reclassifications	(9,544)	(36,953)
Amounts reclassified from accumulated other comprehensive income (loss)	987	(21)
Net current period other comprehensive income (loss)	(8,557)	(36,974)
Ending balance, value	(80,713)	(143,208)
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, value	(78,139)	(107,480)
Other comprehensive income (loss) before reclassifications	(5,879)	(29,298)
Net current period other comprehensive income (loss)	(5,879)	(29,298)
Ending balance, value	(84,018)	(136,778)
Derivative Valuation, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, value	8,431	4,182
Other comprehensive income (loss) before reclassifications	(3,773)	(7,913)
Amounts reclassified from accumulated other comprehensive income (loss)	1,059	110
Net current period other comprehensive income (loss)	(2,714)	(7,803)
Ending balance, value	5,717	(3,621)
Other Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, value	(2,448)	(2,936)
Other comprehensive income (loss) before reclassifications	108	258
Amounts reclassified from accumulated other comprehensive income (loss)	(72)	(131)
Net current period other comprehensive income (loss)	36	127
Ending balance, value	$ (2,412)	$ (2,809)

ACCUMULATED OTHER COMPREHENSI_4

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (INCOME STATEMENT CLASSIFICATION TABLE) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Presentation of Income Statement Reclassifications [Line Items]
Sales Revenue Services Net	$ 539,219	$ 432,213
Benefit from (provision for) income taxes	(15,979)	(10,199)
Net income	55,024	24,685
Accumulated Other Comprehensive Income (Loss)
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other	(987)	21
Derivative Valuation, Net of Tax
Presentation of Income Statement Reclassifications [Line Items]
Net Income (Loss) - Other	(1,059)	(110)
Reclassification from accumulated other comprehensive income
Presentation of Income Statement Reclassifications [Line Items]
Cost of services	(80)	(146)
Net Income (Loss) - Other	(72)	(131)
Reclassification from accumulated other comprehensive income | Tax effect
Presentation of Income Statement Reclassifications [Line Items]
Benefit from (provision for) income taxes	(372)	(41)
Provision for income taxes - Other	8	15
Reclassification from accumulated other comprehensive income | Derivative Valuation, Net of Tax
Presentation of Income Statement Reclassifications [Line Items]
Net income	1,059	110
Foreign Exchange Forward | Reclassification from accumulated other comprehensive income | Foreign Currency Translation Adjustment
Presentation of Income Statement Reclassifications [Line Items]
Sales Revenue Services Net	$ 1,431	$ 151

WEIGHTED AVERAGE SHARE COUNTS_2

WEIGHTED AVERAGE SHARE COUNTS (DILUTED SHARES TABLE) (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Shares used in basic earnings per share calculation	46,743	46,498
Effect of dilutive securities:
Restricted stock units	612	315
Total effects of dilutive securities	612	315
Shares used in dilutive earnings per share calculation	47,355	46,813

WEIGHTED AVERAGE SHARE COUNTS_3

WEIGHTED AVERAGE SHARE COUNTS (NARRATIVE) (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restricted Stock Units (RSUs) [Member]
Anti-dilutive options to purchase common stock [Line Items]
Anti-dilutive securities	0	66,000

EQUITY-BASED COMPENSATION PLANS

EQUITY-BASED COMPENSATION PLANS (NARRATIVE) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 4,028	$ 2,919
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	$ 3,300	$ 2,600
Unrecognized Compensation Expense	$ 28,500
Non-option Equity Awards Granted	44,471	112,915
Performance Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
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 for the three months ended March 31, 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] | 2019 PRSUs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 300	$ 400
Performance Shares [Member] | 2020 PRSUs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	500
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	1,300	1,000
Selling General And Administrative Expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 2,700	$ 1,900

RELATED PARTY TRANSACTIONS (NAR

RELATED PARTY TRANSACTIONS (NARRATIVE) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Related Party Transaction Line Items
Sales Revenue Services Net	$ 539,219,000	$ 432,213,000
Airmax [Member]
Related Party Transaction Line Items
Purchases from Related Party	300,000	100,000
Accounts Payable Due from Related Party	255,000
Welltok
Related Party Transaction Line Items
Sales Revenue Services Net	$ 500,000	$ 900,000