Segment And Geographic Information (Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 679,856	$ 603,550	$ 616,904	$ 566,501	$ 607,507	$ 574,341	$ 579,342	$ 549,225	$ 625,719	$ 630,191	$ 664,038	$ 620,925	$ 2,466,811	$ 2,310,415	$ 2,540,873
Depreciation and amortization													48,672	55,139	49,672
Income from operations													78,603	75,638	92,969
Capital expenditures													54,506	32,334	38,062
Total assets	2,097,317				1,998,668				1,893,878				2,097,317	1,998,668	1,893,878
Elimination Of Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Net sales													(84,820)	(79,373)	(99,475)
Corporate And Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Income from operations													(77,112)	(67,528)	(54,360)
Americas [Member]
Segment Reporting Information [Line Items]
Net sales													1,606,642	1,552,980	1,615,393
Depreciation and amortization													21,972	23,275	23,881
Income from operations													71,638	84,457	77,213
Capital expenditures													27,139	20,766	18,390
Total assets	804,698				864,388				867,858				804,698	864,388	867,858
Asia [Member]
Segment Reporting Information [Line Items]
Net sales													768,588	675,801	878,307
Depreciation and amortization													11,849	15,832	17,031
Income from operations													73,263	48,285	62,967
Capital expenditures													18,115	7,858	11,851
Total assets	670,807				634,838				604,554				670,807	634,838	604,554
Europe [Member]
Segment Reporting Information [Line Items]
Net sales													176,401	161,007	146,648
Depreciation and amortization													2,891	2,794	2,628
Income from operations													10,814	10,424	7,149
Capital expenditures													4,915	1,441	4,323
Total assets	470,264				393,443				305,833				470,264	393,443	305,833
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 151,548				$ 105,999				$ 115,633				151,548	105,999	115,633
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization													11,960	13,238	6,132
Capital expenditures													$ 4,337	$ 2,269	$ 3,498