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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Geographic net sales	$ 508,444	$ 555,229	$ 601,602	$ 602,820	$ 657,050	$ 640,688	$ 660,591	$ 608,136	$ 666,036	$ 610,929	$ 619,611	$ 557,903	$ 2,268,095	$ 2,566,465	$ 2,454,479
Long-lived assets	367,402				301,589				282,480				367,402	301,589	282,480
United States [Member]
Segment Reporting Information [Line Items]
Geographic net sales													1,508,966	1,741,321	1,650,791
Long-lived assets	247,073				190,056				167,858				247,073	190,056	167,858
Asia [Member]
Segment Reporting Information [Line Items]
Geographic net sales													391,029	423,245	432,530
Long-lived assets	76,507				79,051				77,750				76,507	79,051	77,750
Europe [Member]
Segment Reporting Information [Line Items]
Geographic net sales													266,216	299,676	291,006
Long-lived assets	20,258				9,537				11,042				20,258	9,537	11,042
Other Foreign [Member]
Segment Reporting Information [Line Items]
Geographic net sales													101,884	102,223	80,152
Long-lived assets	$ 23,563				$ 22,945				$ 25,830				$ 23,563	$ 22,945	$ 25,830