Segment And Geographic Information (Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Sales	$ 525,951	$ 555,229	$ 1,531,881	$ 1,759,651
Depreciation and amortization	12,408	12,264	36,939	36,389
Income from operations	8,659	9,798	13,277	37,826
Interest expense	(2,136)	(1,687)	(6,189)	(5,014)
Interest income	154	734	1,040	3,084
Other income (expense), net	439	(136)	(191)	2,276
Income before income taxes	7,116	8,709	7,937	38,172
Capital expenditures	5,812	10,447	29,102	25,942
Total assets	1,734,507		1,734,507		$ 1,759,874
Elimination Of Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Sales	(16,735)	(19,865)	(61,213)	(63,100)
Corporate And Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Income from operations	(20,663)	(16,159)	(58,580)	(57,372)
Americas [Member]
Segment Reporting Information [Line Items]
Sales	305,636	344,361	908,832	1,140,581
Depreciation and amortization	5,844	5,646	17,191	16,323
Income from operations	10,062	10,877	21,700	48,437
Capital expenditures	2,134	4,210	17,992	11,910
Total assets	810,455		810,455		792,180
Asia [Member]
Segment Reporting Information [Line Items]
Sales	197,507	188,092	557,495	549,671
Depreciation and amortization	2,801	2,820	8,247	8,363
Income from operations	17,865	13,209	45,887	41,666
Capital expenditures	1,330	3,965	4,646	7,901
Total assets	536,991		536,991		533,508
Europe [Member]
Segment Reporting Information [Line Items]
Sales	39,543	42,641	126,767	132,499
Depreciation and amortization	706	750	2,131	2,322
Income from operations	1,395	1,871	4,270	5,095
Capital expenditures	252	1,304	1,294	2,035
Total assets	127,392		127,392		139,977
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Total assets	259,669		259,669		$ 294,209
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	3,057	3,048	9,370	9,381
Capital expenditures	$ 2,096	$ 968	$ 5,170	$ 4,096