Benefit Plans - Contributions and Benefit Payments, Multiemployer Plan, 401(k) Plans and UMWA Benefit Plans (Details) $ in Thousands	12 Months Ended
	Dec. 29, 2018 USD ($) bargain_agreement	Dec. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
IAM Plan Trusts [Abstract]
Number of collective bargaining agreements | bargain_agreement	2
Pension contributions under the I.A.M. pension plan trusts	$ 1,300	$ 1,100	$ 1,100
Maximum percentage of employer contributions (less than)	5.00%
401 (k) Plan [Abstract]
Compensation expense for the Company's matching contribution	$ 5,100	5,100	5,200
Contributions to UMWA 1992 Benefit Plan	$ 153	$ 182	$ 197