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Supplemental Equity Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial loss	$ 15,713	$ 11,798	$ 31,408	$ 23,233
Income before income taxes	197,821	331,912	385,828	454,001
Income tax effect	(66,331)	(106,000)	(126,854)	(158,500)
Amounts reclassified from accumulated other comprehensive income	9,660	6,888	19,305	13,990
Accumulated Defined Benefit Plans Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income	9,660	6,888	19,305	13,990
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service credit	(618)	(1,215)	(1,236)	(1,700)
Amortization of actuarial loss	15,713	11,798	31,408	23,233
Income before income taxes	15,095	10,583	30,172	21,533
Income tax effect	$ (5,435)	$ (3,695)	$ (10,867)	$ (7,543)

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