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Interest Rate Swaps in Effect (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 30, 2017
Debt Disclosure [Line Items] |  |  |  |  |
Fixed Interest Rate | 1.66% |  | 1.66% |  |
Derivative Notional Amount, NonCurrent | $ 499,000 |  | $ 499,000 |  |
Interest Rate Derivative Liabilities, at Fair Value | 20,900 |  | 20,900 |  |
Foreign Exchange Forward |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Derivative, Fair Value, Net | (1,200) |  | (1,200) |  |
Other Noncurrent Assets [Member] | Interest Rate Swap [Member] |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Interest Rate Fair Value Hedge Asset at Fair Value | 20,875 |  | 20,875 |  | $ 10,266
Other Comprehensive Income | Interest Rate Swap [Member] |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | 4,338 | $ (1,955) | 10,958 | $ (1,643) |
Interest Expense | Interest Rate Swap [Member] |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Gain/(loss) reclassified from accumulated other comprehensive income (effective portion) | 248 | (284) | 236 | (806) |
Other Expense | Interest Rate Swap [Member] |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net | $ (161) | $ (8) | $ (113) | $ (15) |

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