Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 30, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net earnings available to common shareholders	$ 85,510	$ 60,732
Weighted average shares outstanding for basic earnings per share	169,073,000	167,304,000
Dilutive effect of stock options computed using the treasury stock method and the average market price	6,576,000	5,833,000
Weighted average shares outstanding for diluted earnings per share	175,649,000	173,137,000
Basic earnings per share	$ 0.51	$ 0.36
Diluted earnings per share	$ 0.49	$ 0.35
Antidilutive securities excluded from the computation of diluted earnings per share	1,020,000	2,655,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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