Benefit Plans - Pension Assets by Percentage (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	$ 164,603	$ 186,336
Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	12,984	5,364
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Long-term asset	$ 164,603	$ 186,336	$ 169,140
Asset category [Abstract]
Total plan assets	100.00%	100.00%
Expected long-term rate of return on plan assets	5.05%	5.27%
Pension Plan [Member] | Equity Securities [Member]
Asset category [Abstract]
Total plan assets	35.00%	46.00%
Pension Plan [Member] | Fixed Income Funds [Member]
Asset category [Abstract]
Total plan assets	54.00%	48.00%
Pension Plan [Member] | Cash and Cash Equivalents [Member]
Asset category [Abstract]
Total plan assets	8.00%	3.00%
Pension Plan [Member] | Alternative Investments [Member]
Asset category [Abstract]
Total plan assets	3.00%	3.00%
Pension Plan [Member] | Minimum [Member] | Fixed Income Funds [Member]
Asset category [Abstract]
Total plan assets	60.00%
Pension Plan [Member] | Maximum [Member] | Equity Securities [Member]
Asset category [Abstract]
Total plan assets	30.00%
Pension Plan [Member] | Maximum [Member] | Alternative Investments [Member]
Asset category [Abstract]
Total plan assets	5.00%