Operating Segments and Geographic Information (Information Related To Reportable Operating Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total consolidated revenues	$ 358,899	$ 328,004	$ 654,848	$ 611,152
Total income from operations	47,831	37,064	80,409	62,986
Foreign currency gains (losses), net	(261)	283	(1,478)	1,354
Interest income	131	146	326	425
Interest expense	(2,421)	(132)	(4,238)	(245)
Other income	(604)	16	(14)	69
Income before income taxes	44,676	37,377	75,005	64,589
Total consolidated depreciation and amortization	5,729	7,231	11,865	14,874
Total long-lived assets	246,640		246,640		$ 69,515
Total consolidated assets	714,141		714,141		468,901
Americas
Segment Reporting Information [Line Items]
Total consolidated revenues	170,440	137,762	299,566	261,592
Asia Pacific
Segment Reporting Information [Line Items]
Total consolidated revenues	118,424	122,303	209,471	213,482
EMEA
Segment Reporting Information [Line Items]
Total consolidated revenues	69,961	67,644	145,685	135,470
Reportable Operating Segments
Segment Reporting Information [Line Items]
Total consolidated revenues	358,825	327,709	654,722	610,544
Total income from operations	107,561	94,777	192,895	167,763
Total consolidated depreciation and amortization	1,271	2,075	2,625	4,427
Total long-lived assets	171,099		171,099		17,933
Total consolidated assets	571,692		571,692		362,716
Reportable Operating Segments | Americas
Segment Reporting Information [Line Items]
Total consolidated revenues	170,440	137,762	299,566	261,592
Total income from operations	56,945	39,689	90,554	68,228
Total consolidated depreciation and amortization	869	1,211	1,778	2,515
Total long-lived assets	131,963		131,963		12,977
Total consolidated assets	322,207		322,207		157,016
Reportable Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Total consolidated revenues	118,424	122,303	209,471	213,482
Total income from operations	28,083	33,672	54,764	57,780
Total consolidated depreciation and amortization	208	537	432	1,233
Total long-lived assets	23,937		23,937		1,831
Total consolidated assets	155,602		155,602		139,679
Reportable Operating Segments | EMEA
Segment Reporting Information [Line Items]
Total consolidated revenues	69,961	67,644	145,685	135,470
Total income from operations	22,533	21,416	47,577	41,755
Total consolidated depreciation and amortization	194	327	415	679
Total long-lived assets	15,199		15,199		3,125
Total consolidated assets	93,883		93,883		66,021
Reportable Operating Segments | Other businesses
Segment Reporting Information [Line Items]
Total consolidated revenues	74	295	126	608
Total income from operations	(10,133)	(16,531)	(26,470)	(27,465)
Total consolidated depreciation and amortization	1,058	1,431	2,381	2,955
Unallocated corporate and other
Segment Reporting Information [Line Items]
Total income from operations	(49,597)	(41,182)	(86,016)	(77,312)
Total consolidated depreciation and amortization	3,400	3,725	6,859	7,492
Total long-lived assets	42,913		42,913		39,586
Total consolidated assets	94,589		94,589		75,077
Impact of Change in Segment Composition | Adjustments for revised presentation | Reportable Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Total consolidated revenues		(6,097)		(12,080)
Total income from operations		(2,715)		(5,191)
Impact of Change in Segment Composition | Adjustments for revised presentation | Reportable Operating Segments | EMEA
Segment Reporting Information [Line Items]
Total consolidated revenues		6,097		12,080
Total income from operations		$ 2,715		$ 5,191
Supply Chain
Segment Reporting Information [Line Items]
Total long-lived assets	32,628		32,628		11,996
Total consolidated assets	$ 47,860		$ 47,860		$ 31,108