Benefit Plans - Contributions and Benefit Payments, Multiemployer Plan, 401(k) Plans and UMWA Benefit Plans (Details) $ in Thousands	12 Months Ended
	Dec. 30, 2017 USD ($) bargain_agreement	Dec. 31, 2016 USD ($)	Dec. 26, 2015 USD ($)
IAM Plan Trusts [Abstract]
Number of collective bargaining agreements | bargain_agreement	2
Pension contributions under the I.A.M. pension plan trusts	$ 1,100	$ 1,100	$ 1,100
Maximum percentage of employer contributions	5.00%
401 (k) Plan [Abstract]
Compensation expense for the Company's matching contribution	$ 5,100	5,200	4,200
Contributions to UMWA 1992 Benefit Plan	182	$ 197	$ 214
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Company's expected contribution to benefit plans in next fiscal year	1,000
Other Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Company's expected contribution to benefit plans in next fiscal year	$ 1,200