Debt (Senior Notes) (Details) (USD $)	0 Months Ended	3 Months Ended		0 Months Ended	3 Months Ended			0 Months Ended		0 Months Ended	3 Months Ended
	Sep. 25, 2013	Mar. 29, 2014	Mar. 30, 2013	Dec. 19, 2012 Secured Credit Facility [Member]	Mar. 29, 2014 Secured Credit Facility [Member]	Mar. 29, 2014 Secured Credit Facility [Member] Carrying Value [Member]	Dec. 31, 2013 Secured Credit Facility [Member] Carrying Value [Member]	Jan. 31, 2013 3.85% Senior Notes Due February 1,2023 [Member]	Mar. 29, 2014 3.85% Senior Notes Due February 1,2023 [Member]	Jan. 17, 2006 6.125% Notes, Payable January 15, 2016 [Member]	Mar. 30, 2013 6.125% Notes, Payable January 15, 2016 [Member]	Mar. 29, 2014 6.125% Notes, Payable January 15, 2016 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debts								$ 600,000,000		$ 900,000,000
Interest rate percentage								3.85%	3.85%	6.125%		6.125%
Payment of financing costs	1,836,000							6,000,000
Notes payable, maturity date										Jan. 15, 2016
Increase in interest rate from rating agency downgrade											0.25%
Maximum increase in interest rate per agency from rating agency downgrade											1.00%
Increase in interest expense per quarter for .25% increase in notes per $100,000 of outstanding notes		22,096,000	19,156,000								63,000
Incremental increase in outstanding notes										100,000,000
Term of line of credit (years)				3 years
Maximum borrowing capacity under credit facility				300,000,000
Basis spread on debt instrument				0.75%
Commitment fee percentage					0.30%
Securitization facility						$ 300,000,000	$ 300,000,000