Segment And Geographic Information (Schedule Of Geographic Net Sales And Long-Lived Assets) (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]
Geographic 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
Long-lived assets	282,480				268,070				290,945				282,480	268,070	290,945
United States [Member]
Segment Reporting Information [Line Items]
Geographic net sales													1,659,404	1,615,749	1,848,503
Long-lived assets	167,858				167,367				172,958				167,858	167,367	172,958
Asia [Member]
Segment Reporting Information [Line Items]
Geographic net sales													434,332	334,305	314,160
Long-lived assets	77,750				67,998				77,237				77,750	67,998	77,237
Europe [Member]
Segment Reporting Information [Line Items]
Geographic net sales													292,490	252,972	221,911
Long-lived assets	11,042				8,415				9,704				11,042	8,415	9,704
Other Foreign [Member]
Segment Reporting Information [Line Items]
Geographic net sales													80,585	107,389	156,299
Long-lived assets	$ 25,830				$ 24,290				$ 31,046				$ 25,830	$ 24,290	$ 31,046