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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Net periodic benefit expense:        
Interest cost $ 7,274 $ 6,535 $ 21,783 $ 19,593
Expected return on plan assets (6,605) (4,910) (19,780) (14,723)
Net periodic benefit expense $ 669 $ 1,625 $ 2,003 $ 4,870