Supplemental Stockholders' Equity Information - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification, before tax	$ 31,460	$ 27,165
Income tax expense	1,304	5,251
Total reclassification, net of tax	30,156	$ 21,914
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassification, before tax	(4,896)
Income tax expense	(1,288)
Total reclassification, net of tax	(3,608)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortizations	1,677
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortizations	$ (6,573)