Common Stock And Earnings Per Share (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Common Stock And Earnings Per Share [Abstract]
Shares repurchased and retired	1,358	178	2,009	217
Repurchase of common stock	$ 92,377	$ 22,647	$ 150,000	$ 25,590
Remaining approved repurchase amount	$ 30,000		$ 30,000

Number of shares that have been repurchased and retired during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration