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Debt (Senior Notes) (Details) (USD $) | 3 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2013 | Mar. 31, 2012 | Jan. 31, 2013 3.85% Senior Notes Due February 1,2023 [Member] | Jan. 17, 2006 6.125% Notes, Payable January 15, 2016 [Member] | Mar. 31, 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] | Mar. 30, 2013 7.20% Senior Notes, Payable April 15, 2012 [Member] | Mar. 31, 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 |  |  | 5,150,000 |  |  |  |  |  |  |
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 | 19,156,000 | 22,498,000 |  | 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 |  |  |

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