Segment And Geographic Information (Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 660,591	$ 619,611	$ 1,268,727	$ 1,177,514
Depreciation and amortization	12,699	12,044	25,083	24,317
Income from operations	14,349	23,124	32,316	34,013
Interest expense	(2,293)	(2,312)	(4,721)	(4,537)
Interest income	1,645	1,213	3,578	2,287
Other Non operating Income Expense	(355)	(830)	(312)	(911)
Income before income taxes	13,346	21,195	30,861	30,852
Capital expenditures	17,486	18,801	38,363	26,379
Total assets	2,037,185		2,037,185		$ 2,109,304
Elimination Of Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(17,670)	(23,313)	(34,237)	(46,678)
Corporate And Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Income from operations	(20,202)	(18,999)	(39,616)	(36,480)
Americas [Member]
Segment Reporting Information [Line Items]
Net sales	434,278	405,434	813,063	766,754
Depreciation and amortization	5,816	5,415	11,425	10,920
Income from operations	15,522	19,157	32,259	31,777
Capital expenditures	12,545	5,770	25,394	9,036
Total assets	845,315		845,315		812,187
Asia [Member]
Segment Reporting Information [Line Items]
Net sales	197,628	194,480	392,750	373,784
Depreciation and amortization	2,871	2,973	5,693	6,139
Income from operations	16,829	20,457	34,478	33,837
Capital expenditures	2,937	8,714	8,650	11,124
Total assets	537,064		537,064		674,783
Europe [Member]
Segment Reporting Information [Line Items]
Net sales	46,355	43,010	97,151	83,654
Depreciation and amortization	900	679	1,784	1,336
Income from operations	2,200	2,509	5,195	4,879
Capital expenditures	630	2,466	1,652	3,380
Total assets	147,875		147,875		470,786
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Total assets	506,931		506,931		$ 151,548
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	3,112	2,977	6,181	5,922
Capital expenditures	$ 1,374	$ 1,851	$ 2,667	$ 2,839