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Debt (Senior Notes) (Details) - Credit Facility [Domain] |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 09, 2015 USD ($) | Nov. 03, 2014 USD ($) | Aug. 15, 2014 USD ($) | Jan. 31, 2013 USD ($) | Jan. 17, 2006 USD ($) | Jul. 04, 2015 USD ($) | Jun. 28, 2014 USD ($) | Jul. 04, 2015 USD ($) | Jun. 28, 2014 USD ($) | Jun. 12, 2015 | Jun. 09, 2015 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in interest expense per quarter for .25% increase in notes per $100,000 of outstanding notes |  |  |  |  |  | $ 16,838,000 | $ 20,702,000 | $ 33,287,000 | $ 42,798,000 |  |
3.85% Senior Notes Due February 1,2023 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debts |  |  |  | $ 600,000,000 |  |  |  |  |  |  |
Interest rate percentage |  |  |  | 3.85% |  | 3.85% |  | 3.85% |  |  |
Payment of financing costs |  |  |  | $ 6,000,000 |  |  |  |  |  |  |
6.125% Notes, Payable January 15, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debts |  |  |  |  | $ 900,000,000 |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 6.125% | 6.125% |  | 6.125% |  |  |
Senior notes due 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 |  |  |  |  |  |  |  | $ 63,000 |  |  |
Incremental increase in outstanding notes |  |  |  |  | $ 100,000,000 |  |  |  |  |  |
Amount of debt repurchased |  | $ 54,400,000 | $ 200,000,000 |  |  |  |  |  |  |  |
Price as a percentage of the principal amount debt repurchased |  | 106.38% | 107.73% |  |  |  |  |  |  |  |
6.125% Notes, Payable January 15, 2016 [Member] | Interest Expense [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premium to tendering noteholders |  | $ 3,500,000 | $ 15,450,000 |  |  |  |  |  |  |  |
Fees associated with cash tender |  |  | $ 1,080,000 |  |  |  |  |  |  |  |
2.00% Notes, Payable January 14, 2022 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debts | € |  |  |  |  |  |  |  |  |  |  | € 500,000,000
Interest rate percentage |  |  |  |  |  | 2.00% |  | 2.00% |  | 2.00% | 2.00%
Payment of financing costs | $ 4,226,000 |  |  |  |  |  |  |  |  |  |

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