Leases (Details) $ in Thousands	12 Months Ended
	Dec. 30, 2017 USD ($) property	Dec. 31, 2016 USD ($)	Jan. 02, 2016 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018	$ 45,345
2019	39,414
2020	26,180
2021	14,770
2022	6,130
Thereafter	13,186
Total	145,025
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018	927
2019	311
2020	157
2021	0
2022	0
Thereafter	0
Total	1,395
Less amounts representing interest	(60)
Capital lease obligations included in current and long-term debt	1,335
Operating Leases, Rent Expense, Net	$ 48,700	$ 43,600	$ 41,500
Processing Plants and Storage Locations [Member]
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Number Of Properties Leased | property	14
Office Locations [Member]
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Number Of Properties Leased | property	3