Supplemental Stockholders' Equity Information - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortizations	$ (173,014)	$ (155,857)	$ (341,097)	$ (310,198)
Total reclassification, before tax	34,586	33,595	66,046	60,760
Income tax expense	9,415	9,999	10,719	15,250
Total reclassification, net of tax	$ 25,171	$ 23,596	55,327	$ 45,510
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification, before tax			9,792
Income tax expense			2,535
Total reclassification, net of tax			7,257
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortizations			(3,354)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortizations			$ 13,146