Segment And Geographic Information (Operating 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]
Net sales	$ 601,602	$ 660,591	$ 1,204,422	$ 1,268,727
Depreciation and amortization	11,953	12,699	24,125	25,083
Income from operations	11,941	14,349	28,028	32,316
Interest expense	(1,718)	(2,293)	(3,327)	(4,721)
Interest income	1,053	1,645	2,350	3,578
Other income (expense)	808	(355)	2,412	(312)
Income before income taxes	12,084	13,346	29,463	30,861
Capital expenditures	5,421	17,486	15,495	38,363
Total assets	1,827,878		1,827,878		$ 1,899,783
Elimination Of Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(22,628)	(17,670)	(43,235)	(34,237)
Corporate And Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Income from operations	(20,747)	(20,202)	(41,213)	(39,616)
Americas [Member]
Segment Reporting Information [Line Items]
Net sales	404,162	434,278	796,220	813,063
Depreciation and amortization	5,296	5,816	10,677	11,425
Income from operations	17,332	15,522	37,560	32,259
Capital expenditures	2,947	12,545	7,700	25,394
Total assets	808,824		808,824		852,776
Asia [Member]
Segment Reporting Information [Line Items]
Net sales	174,170	197,628	361,579	392,750
Depreciation and amortization	2,732	2,871	5,543	5,693
Income from operations	13,072	16,829	28,457	34,478
Capital expenditures	1,098	2,937	3,936	8,650
Total assets	543,801		543,801		540,094
Europe [Member]
Segment Reporting Information [Line Items]
Net sales	45,898	46,355	89,858	97,151
Depreciation and amortization	758	900	1,572	1,784
Income from operations	2,284	2,200	3,224	5,195
Capital expenditures	343	630	731	1,652
Total assets	135,214		135,214		113,165
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Total assets	340,039		340,039		$ 393,748
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	3,167	3,112	6,333	6,181
Capital expenditures	$ 1,033	$ 1,374	$ 3,128	$ 2,667