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Debt and Credit Arrangements - Effect of Derivatives on Financial Statements (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Debt and Credit Arrangements |  |  |
Total Interest Expense on Consolidated Statements of Income | $ (11,283,000) | $ (7,397,000) | $ (5,676,000)
Weighted average interest rates on debt, including the impact of interest rate swap agreements | 2.70% | 2.10% | 2.00%
Interest paid, including payments made or received under the swaps | $ 10,800,000 | $ 7,100,000 | $ 5,300,000
Interest rate swap | Other current and long-term assets |  |  |
Debt and Credit Arrangements |  |  |
Interest rate swap assets | $ 651,000 |  |
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 | $ 281,000 |  |
Interest expense | Interest rate swap |  |  |
Debt and Credit Arrangements |  |  |
Amount of Gain or (Loss) Recognized in AOCL on Derivative | 891,000 | 940,000 | (1,163,000)
Amount of Gain or (Loss) Reclassified from AOCL into Income | (421,000) | (1,161,000) | (1,563,000)
Total Interest Expense on Consolidated Statements of Income | $ (11,283,000) | $ (7,397,000) | $ (5,676,000)

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