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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 15, 2017 | Jul. 16, 2016 | Jul. 15, 2017 | Jul. 16, 2016
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |  |
Net income |  | $ 44,740 | $ 51,155 | $ 105,158 | $ 110,518
Pension and postretirement plans: |  |  |  |  |
Settlement loss |  |  | 2,854 |  | 2,854
Net loss for the period |  |  | (36,407) |  | (36,407)
Amortization of prior service cost included in net income |  | 25 | 17 | 58 | 50
Amortization of actuarial loss included in net income |  | 833 | 646 | 1,943 | 1,666
Pension and postretirement plans, net of tax |  | 858 | (32,890) | 2,001 | (31,837)
Derivative instruments: |  |  |  |  |
Net change in fair value of derivatives | [1] | 7,238 | (3,525) | 3,720 | (937)
Loss reclassified to net income |  | 320 | 803 | 794 | 1,946
Derivative instruments, net of tax |  | 7,558 | (2,722) | 4,514 | 1,009
Other comprehensive income (loss), net of tax |  | 8,416 | (35,612) | 6,515 | (30,828)
Comprehensive income |  | $ 53,156 | $ 15,543 | $ 111,673 | $ 79,690
[1] | Amounts in parentheses indicate debits to determine net income.

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