Operating Segments and Geographic Information (Information Related To Reportable Operating Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total consolidated revenues	$ 295,949	$ 283,148
Total income from operations	32,578	25,922
Foreign currency gains (losses), net	(1,217)	1,071
Interest income	195	279
Interest expense	(1,817)	(113)
Other income	590	53
Income before income taxes	30,329	27,212
Total consolidated depreciation and amortization	6,136	7,643
Total long-lived assets	239,443		$ 69,515
Total consolidated assets	689,206		468,901
Americas
Segment Reporting Information [Line Items]
Total consolidated revenues	129,126	123,830
Asia Pacific
Segment Reporting Information [Line Items]
Total consolidated revenues	91,047	91,179
EMEA
Segment Reporting Information [Line Items]
Total consolidated revenues	75,724	67,826
Reportable Operating Segments
Segment Reporting Information [Line Items]
Total consolidated revenues	295,897	282,835
Total income from operations	85,334	72,986
Total consolidated depreciation and amortization	1,354	2,352
Total long-lived assets	171,301		17,933
Total consolidated assets	553,464		362,716
Reportable Operating Segments | Americas
Segment Reporting Information [Line Items]
Total consolidated revenues	129,126	123,830
Total income from operations	33,609	28,539
Total consolidated depreciation and amortization	909	1,304
Total long-lived assets	134,931		12,977
Total consolidated assets	304,725		157,016
Reportable Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Total consolidated revenues	91,047	91,179
Total income from operations	26,681	24,108
Total consolidated depreciation and amortization	224	696
Total long-lived assets	22,137		1,831
Total consolidated assets	150,909		139,679
Reportable Operating Segments | EMEA
Segment Reporting Information [Line Items]
Total consolidated revenues	75,724	67,826
Total income from operations	25,044	20,339
Total consolidated depreciation and amortization	221	352
Total long-lived assets	14,233		3,125
Total consolidated assets	97,830		66,021
Reportable Operating Segments | Other businesses
Segment Reporting Information [Line Items]
Total consolidated revenues	52	313
Total income from operations	(16,337)	(10,934)
Total consolidated depreciation and amortization	1,323	1,524
Unallocated corporate and other
Segment Reporting Information [Line Items]
Total income from operations	(36,419)	(36,130)
Total consolidated depreciation and amortization	3,459	3,767
Total long-lived assets	43,395		39,586
Total consolidated assets	90,295		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		(5,983)
Total income from operations		(2,476)
Impact of Change in Segment Composition | Adjustments for revised presentation | Reportable Operating Segments | EMEA
Segment Reporting Information [Line Items]
Total consolidated revenues		5,983
Total income from operations		$ 2,476
Supply Chain
Segment Reporting Information [Line Items]
Total long-lived assets	24,747		11,996
Total consolidated assets	$ 45,447		$ 31,108