Segment And Geographic Information (Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 555,229	$ 640,688	$ 1,759,651	$ 1,909,415
Depreciation and amortization	12,264	14,560	36,389	39,643
Income from operations	9,798	10,957	37,826	43,273
Interest expense	(1,687)	(3,822)	(5,014)	(8,543)
Interest income	734	1,619	3,084	5,197
Other income (expense)	(136)	1,139	2,276	827
Income before income taxes	8,709	9,893	38,172	40,754
Capital expenditures	10,447	14,570	25,942	52,933
Total assets	1,758,746		1,758,746		$ 1,899,783
Elimination Of Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(19,865)	(16,656)	(63,100)	(50,893)
Corporate And Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Income from operations	(16,159)	(19,834)	(57,372)	(59,450)
Americas [Member]
Segment Reporting Information [Line Items]
Net sales	344,361	404,137	1,140,581	1,217,200
Depreciation and amortization	5,646	5,746	16,323	17,171
Income from operations	10,877	9,586	48,437	41,845
Capital expenditures	4,210	8,975	11,910	34,369
Total assets	811,158		811,158		852,776
Asia [Member]
Segment Reporting Information [Line Items]
Net sales	188,092	210,153	549,671	602,903
Depreciation and amortization	2,820	2,967	8,363	8,660
Income from operations	13,209	18,963	41,666	53,441
Capital expenditures	3,965	3,898	7,901	12,548
Total assets	535,687		535,687		540,094
Europe [Member]
Segment Reporting Information [Line Items]
Net sales	42,641	43,054	132,499	140,205
Depreciation and amortization	750	860	2,322	2,644
Income from operations	1,871	2,242	5,095	7,437
Capital expenditures	1,304	651	2,035	2,303
Total assets	127,603		127,603		113,165
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Total assets	284,298		284,298		$ 393,748
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	3,048	4,987	9,381	11,168
Capital expenditures	$ 968	$ 1,046	$ 4,096	$ 3,713