Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Earnings Per Share, Diluted [Line Items]
Net income attributable to shareholders		$ 134,630	$ 117,727	$ 348,077	$ 358,232
Weighted average shares outstanding - basic		88,453	90,937	88,870	91,412
Net effect of various dilutive stock-based compensation awards		1,087	1,001	1,066	1,075
Weighted average shares outstanding - diluted		89,540	91,938	89,936	92,487
Net income per share:
Basic		$ 1.52	$ 1.29	$ 3.92	$ 3.92
Diluted	[1]	$ 1.50	$ 1.28	$ 3.87	$ 3.87
Stock Compensation Plan [Member]
Net income per share:
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		396	824	363	821

[1] Stock-based compensation awards for the issuance of 396 and 363 shares for the third quarter and first nine months of 2017 and 824 and 821 shares for the third quarter and first nine months 2016, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.