Leases (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2014	$ 20,944,000
2015	17,482,000
2016	15,077,000
2017	13,023,000
2018	11,534,000
Thereafter	25,004,000
Total	103,064,000
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2014	3,208,000
2015	2,715,000
2016	2,153,000
2017	1,611,000
2018	866,000
Thereafter	421,000
Total	10,974,000
Less amounts representing interest	(987,000)
Capital Lease Obligations included in current and long-term debt	9,987,000
Operating Leases, Rent Expense, Net	$ 14,400,000	$ 12,600,000	$ 12,300,000
Processing Plants and Storage Locations [Member]
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Number Of Properties Leased	10
Office Locations [Member]
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Number Of Properties Leased	4
Butler Properties [Member]
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Number Of Properties Leased	2