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Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) property	Jan. 02, 2016 USD ($)	Jan. 03, 2015 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	$ 39,481
2018	35,653
2019	31,035
2020	19,258
2021	7,421
Thereafter	14,019
Total	146,867
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	1,527
2018	891
2019	285
2020	144
2021	0
Thereafter	0
Total	2,847
Less amounts representing interest	(145)
Capital lease obligations included in current and long-term debt	2,702
Operating Leases, Rent Expense, Net	$ 43,600	$ 41,500	$ 41,000
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

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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