Stock-based Compensation Plans (Stock Options Activity - Table) (Details) - Stock options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
Jul. 01, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at December 31, 2017 (shares)	10,051
Granted (shares)	488
Exercised (shares)	(3,566)
Forfeited or expired (shares)	(178)
Outstanding at July 1, 2018 (shares)	6,795	10,051
Exercisable at July 1, 2018	4,461
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at December 31, 2017	$ 14.89
Granted (per share)	24.01
Exercised (per share)	10.23
Forfeited or expired (per share)	20.47
Outstanding at July 1, 2018	17.85	$ 14.89
Exercisable at July 1, 2018	$ 17.02
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term	5 years 11 months 4 days	5 years 2 months 3 days
Outstanding intrinsic value	$ 25,734	$ 71,373
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average remaining contractual term	4 years 7 months 22 days
Exercisable intrinsic value	$ 21,278

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.