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STOCKHOLDERS' EQUITY (Schedule of Changes in Unrealized Actuarial Losses) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 28, 2014
Sep. 29, 2013
Sep. 28, 2014
Sep. 29, 2013
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]        
Balance, beginning of period     $ (45,735) [1]  
Other comprehensive income (loss) before reclassifications     (9,925) [1]  
Amounts reclassified from accumulated other comprehensive loss to net income     (155) [1]  
Total other comprehensive income (loss), net of tax (636) 313 (10,080) [1] 36,114
Balance, end of period (55,815) [1]   (55,815) [1]  
Losses Related to Pension and Other Postretirement Benefits [Member]
        
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]        
Balance, beginning of period     (45,797) [1] (68,511) [1]
Other comprehensive income (loss) before reclassifications     (10,094) [1] 35,363 [1]
Amounts reclassified from accumulated other comprehensive loss to net income     26 [1] 751 [1]
Total other comprehensive income (loss), net of tax     (10,068) [1] 36,114 [1]
Balance, end of period (55,865) [1] (32,397) [1] (55,865) [1] (32,397) [1]
Unrealized Holding Gains on Available-for-Sale Securities [Member]
        
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]        
Balance, beginning of period     62 [1]  
Other comprehensive income (loss) before reclassifications     169 [1]  
Amounts reclassified from accumulated other comprehensive loss to net income     (181) [1]  
Total other comprehensive income (loss), net of tax     (12) [1]  
Balance, end of period $ 50 [1]   $ 50 [1]  
[1] All amounts are net of tax. Amounts in parentheses indicate debits to accumulated other comprehensive loss.