OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION (Information Related To Reportable Operating Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total consolidated revenues	$ 331,549	$ 358,899	$ 612,709	$ 654,848
Total income from operations	56,595	47,831	77,407	80,409
Foreign currency losses, net	(687)	(261)	(918)	(1,478)
Interest income	49	131	146	326
Interest expense	(2,170)	(2,421)	(4,091)	(4,238)
Other income (expense), net	907	(604)	928	(14)
Income before income taxes	54,694	44,676	73,472	75,005
Total consolidated depreciation and amortization	6,592	5,729	13,499	11,865
Americas
Segment Reporting Information [Line Items]
Total consolidated revenues	171,584	170,440	319,308	299,566
Asia Pacific
Segment Reporting Information [Line Items]
Total consolidated revenues	93,573	118,424	159,033	209,471
EMEA
Segment Reporting Information [Line Items]
Total consolidated revenues	66,376	69,961	134,276	145,685
Reportable Operating Segments
Segment Reporting Information [Line Items]
Total consolidated revenues	331,533	358,825	612,617	654,722
Total income from operations	100,929	107,561	174,660	192,895
Total consolidated depreciation and amortization	1,345	1,271	2,654	2,625
Reportable Operating Segments | Americas
Segment Reporting Information [Line Items]
Total consolidated revenues	171,584	170,440	319,308	299,566
Total income from operations	64,258	56,945	110,920	90,554
Total consolidated depreciation and amortization	896	869	1,750	1,778
Reportable Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Total consolidated revenues	93,573	118,424	159,033	209,471
Total income from operations	16,318	28,083	25,742	54,764
Total consolidated depreciation and amortization	286	208	565	432
Reportable Operating Segments | EMEA
Segment Reporting Information [Line Items]
Total consolidated revenues	66,376	69,961	134,276	145,685
Total income from operations	20,353	22,533	37,998	47,577
Total consolidated depreciation and amortization	163	194	339	415
Reportable Operating Segments | Other businesses
Segment Reporting Information [Line Items]
Total consolidated revenues	16	74	92	126
Total income from operations	(12,065)	(10,133)	(25,988)	(26,470)
Total consolidated depreciation and amortization	1,702	1,058	3,753	2,381
Unallocated corporate and other
Segment Reporting Information [Line Items]
Total income from operations	(32,269)	(49,597)	(71,265)	(86,016)
Total consolidated depreciation and amortization	$ 3,545	$ 3,400	$ 7,092	$ 6,859