Lease Commitments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013
Operating Leased Assets [Line Items]
Percentage of facilities under operating lease	50.00%
Accrued Rent	455	$ 521
Maximum [Member]
Operating Leased Assets [Line Items]
Lease Expiration Date	Dec. 31, 2029
Lessee Leasing Arrangements, Operating Leases, Renewal Term	20 years
Minimum [Member]
Operating Leased Assets [Line Items]
Lessee Leasing Arrangements, Operating Leases, Renewal Term	5 years