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Debt and Credit Arrangements - Effect of Derivatives on Financial Statements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Dec. 25, 2016
Debt and Credit Arrangements |  |  |
Weighted average interest rates on debt, including the impact of interest rate swap agreements | 3.90% | 2.70% | 2.10%
Interest paid, including payments made or received under the swaps | $ 23,500 | $ 10,800 | $ 7,100
Interest rate swap | Other current and long-term assets |  |  |
Debt and Credit Arrangements |  |  |
Interest rate swap assets | $ 4,900 |  |
Estimate of period of time over which portion of derivative liability would be reclassified into earnings | 12 months |  |
Portion of derivative asset that would be reclassified into earnings | $ 1,300 |  |
Interest expense | Interest rate swap |  |  |
Debt and Credit Arrangements |  |  |
Amount of Gain or (Loss) Recognized in AOCI/AOCL on Derivative | 3,222 | 891 | 940
Amount of Gain or (Loss) Reclassified from AOCI/AOCL into Income | (22) | (421) | (1,161)
Total Interest Expense on Consolidated Statements of Operations | $ (25,306) | $ (11,283) | $ (7,397)

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