Net Income per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 29, 2013		Jun. 30, 2012		Jun. 29, 2013		Jun. 30, 2012
Earnings Per Share, Diluted [Line Items]
Net income attributable to shareholders	$ 89,935		$ 114,383		$ 167,810		$ 228,011
Weighted average shares outstanding - basic	103,225		110,433		104,542		111,218
Net effect of various dilutive stock-based compensation awards	799		1,598		1,350		1,861
Weighted average shares outstanding - diluted	104,024		112,031		105,892		113,079
Net income per share:
Basic	$ 0.87		$ 1.04		$ 1.61		$ 2.05
Diluted	$ 0.86	[1]	$ 1.02	[1]	$ 1.58	[1]	$ 2.02	[1]
Stock Compensation Plan [Member]
Net income per share:
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,296		1,552		1,171		804

[1] Stock-based compensation awards for the issuance of 1,296 and 1,171 shares for the second quarter and first six months of 2013 and 1,552 and 804 shares for the second quarter and first six months of 2012, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.