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STOCKHOLDERS' EQUITY (Schedule of Changes in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 25, 2016 | Dec. 27, 2015 | Dec. 28, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | $ 1,261,810 | $ 2,196,801 | $ 1,492,602
Amounts reclassified from accumulated other comprehensive loss to net income | 67 | 133 |
Total other comprehensive income (loss) | (5,313) | 3,611 | (16,806)
Balance, end of year | 896,747 | 1,261,810 | 2,196,801
Accumulated Other Comprehensive Loss [Member] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | (58,930) | (62,541) | (45,735)
Other comprehensive income (loss) before reclassifications | (5,247) | 3,744 |
Amounts reclassified from accumulated other comprehensive loss to net income | (66) | (133) |
Total other comprehensive income (loss) | (5,313) | 3,611 | (16,806)
Balance, end of year | (64,243) | (58,930) | (62,541)
Losses Related to Pension and Other Postretirement Benefits [Member] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | (58,997) | (62,572) |
Other comprehensive income (loss) before reclassifications | (4,836) | 4,004 |
Amounts reclassified from accumulated other comprehensive loss to net income | (410) | (429) |
Total other comprehensive income (loss) | (5,246) | 3,575 |
Balance, end of year | (64,243) | (58,997) | (62,572)
Unrealized Holding Gains on Available-for-Sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | 67 | 31 |
Other comprehensive income (loss) before reclassifications | (411) | (260) |
Amounts reclassified from accumulated other comprehensive loss to net income | 344 | 296 |
Total other comprehensive income (loss) | (67) | 36 |
Balance, end of year | $ 0 | $ 67 | $ 31

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