Net Income per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 28, 2014		Jun. 29, 2013		Jun. 28, 2014		Jun. 29, 2013
Earnings Per Share, Diluted [Line Items]
Net income attributable to shareholders	$ 127,884		$ 89,935		$ 235,004		$ 167,810
Weighted average shares outstanding - basic	99,449		103,225		99,695		104,542
Net effect of various dilutive stock-based compensation awards	1,113		799		1,285		1,350
Weighted average shares outstanding - diluted	100,562		104,024		100,980		105,892
Net income per share:
Basic	$ 1.29		$ 0.87		$ 2.36		$ 1.61
Diluted	$ 1.27	[1]	$ 0.86	[1]	$ 2.33	[1]	$ 1.58	[1]
Stock Compensation Plan [Member]
Net income per share:
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	316		1,296		241		1,171

[1] Stock-based compensation awards for the issuance of 316 and 241 shares for the second quarter and first six months of 2014 and 1,296 and 1,171 for the second quarter and first six months of 2013, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.