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Net Sales (Schedule of Net Sales by Geographical Area) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 527,781	$ 512,869	$ 410,864	$ 559,417	$ 534,445	$ 555,817	$ 563,417	$ 536,616	$ 2,010,931	$ 2,190,295	$ 2,289,675
United States
Disaggregation of Revenue [Line Items]
Net sales									650,654	728,125	722,576
China
Disaggregation of Revenue [Line Items]
Net sales									213,788	225,498	239,406
Europe, Middle East, Africa, India
Disaggregation of Revenue [Line Items]
Net sales									651,645	700,081	756,258
Asia Pacific, except China
Disaggregation of Revenue [Line Items]
Net sales									279,847	311,469	335,119
Other foreign
Disaggregation of Revenue [Line Items]
Net sales									$ 214,997	$ 225,122	$ 236,316

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