Segment And Geographic Information (Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 602,820	$ 608,136
Depreciation and amortization	12,172	12,384
Income from operations	16,087	17,967
Interest expense	(1,609)	(2,428)
Interest income	1,297	1,933
Other income	1,604	43
Income before income taxes	17,379	17,515
Capital expenditures	10,074	20,877
Total assets	1,868,930		$ 1,899,783
Elimination Of Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(20,607)	(16,567)
Corporate And Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Income from operations	(20,466)	(19,414)
Americas [Member]
Segment Reporting Information [Line Items]
Net sales	392,058	378,785
Depreciation and amortization	5,381	5,609
Income from operations	20,228	16,737
Capital expenditures	4,753	12,849
Total assets	853,218		852,776
Asia [Member]
Segment Reporting Information [Line Items]
Net sales	187,409	195,122
Depreciation and amortization	2,811	2,822
Income from operations	15,385	17,649
Capital expenditures	2,838	5,713
Total assets	550,169		540,094
Europe [Member]
Segment Reporting Information [Line Items]
Net sales	43,960	50,796
Depreciation and amortization	814	884
Income from operations	940	2,995
Capital expenditures	388	1,022
Total assets	127,687		113,165
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Total assets	337,856		$ 393,748
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	3,166	3,069
Capital expenditures	$ 2,095	$ 1,293