Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Consolidated Statements of Comprehensive Income
Revenue	$ 1,509,171	$ 1,477,365	$ 1,275,258
Type of Revenue				us-gaap:TechnologyServiceMember
Operating expenses
Cost of services (exclusive of depreciation and amortization presented separately below)	1,157,927	1,110,068	941,592
Selling, general and administrative	182,428	182,314	175,797
Depreciation and amortization	69,179	64,507	68,675
Restructuring charges, net	6,131	14,665	4,392
Impairment losses	1,452	5,322	32,050
Total operating expenses	1,417,117	1,376,876	1,222,506
Income from operations	92,054	100,489	52,752
Other income (expense)
Interest income	4,476	2,841	1,234
Interest expense	(28,674)	(13,734)	(7,943)
Other income (expense), net	(11,618)	1,869	6,855
Loss on assets held-for-sale		(2,578)
Non-cash loss on assets held-for-sale	0	0	(2,600)
Total other income (expense)	(35,816)	(11,602)	(2,454)
Income before income taxes	56,238	88,887	50,298
Benefit from (provision for) income taxes	(16,483)	(78,075)	(12,863)
Net income	39,755	10,812	37,435
Net income attributable to noncontrolling interest	(3,938)	(3,556)	(3,757)
Net income (loss) attributable to TTEC stockholders	35,817	7,256	33,678
Other comprehensive income (loss)
Foreign currency translation adjustments	(30,382)	8,285	(21,055)
Derivative valuation, gross	11,526	27,931	(7,838)
Derivative valuation, tax effect	(4,058)	(11,284)	2,330
Other, net of tax	308	105	721
Total other comprehensive income (loss)	(22,606)	25,037	(25,842)
Total comprehensive income (loss)	17,149	35,849	11,593
Less: Comprehensive income attributable to noncontrolling interest	(3,624)	(3,933)	(3,514)
Comprehensive income attributable to TTEC stockholders	$ 13,525	$ 31,916	$ 8,079
Weighted average shares outstanding
Basic	46,064	45,826	47,423
Diluted	46,385	46,382	47,736
Net income per share attributable to TTEC stockholders
Basic	$ 0.78	$ 0.16	$ 0.71
Diluted	$ 0.77	$ 0.16	$ 0.71