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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 |  |  |  |  |

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