Debt (Senior Notes) (Details) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended		3 Months Ended	12 Months Ended	0 Months Ended	6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012	Jan. 31, 2013 3.85% Senior Notes Due February 1,2023 [Member]	Jan. 17, 2006 6.125% Notes, Payable January 15, 2016 [Member]	Jun. 30, 2012 6.125% Notes, Payable January 15, 2016 [Member]	Dec. 31, 2009 6.125% Notes, Payable January 15, 2016 [Member]	Apr. 16, 2012 7.20% Senior Notes, Payable April 15, 2012 [Member]	Jun. 29, 2013 7.20% Senior Notes, Payable April 15, 2012 [Member]	Jun. 30, 2012 7.20% Senior Notes, Payable April 15, 2012 [Member]	Dec. 31, 2002 7.20% Senior Notes, Payable April 15, 2012 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debts					$ 600,000,000	$ 900,000,000						$ 400,000,000
Interest rate percentage					3.85%	6.125%				7.20%	7.20%
Payment of financing costs					6,000,000
Notes payable, maturity date						Jan. 15, 2016				Apr. 15, 2012
Increase in interest rate from rating agency downgrade						0.25%
Maximum increase in interest rate per agency from rating agency downgrade						1.00%
Aggregate amount of increase in interest rate from rating agency downgrade								0.75%
Aggregate amount of decrease in interest rate from rating agency downgrade							0.50%
Increase in interest expense per quarter for .25% increase in notes per $100,000 of outstanding notes	25,312,000	18,844,000	44,468,000	41,342,000		63,000
Incremental increase in outstanding notes						100,000
Remaining outstanding senior notes repaid											63,730,000
Repurchase price as percentage of principal amount of senior notes											102.72%
Company repaid principal amount									336,270,000
Debt instruments interest accrued									$ 12,106,000