Leases (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 25, 2012	Dec. 27, 2011
Rent expense for operating leases
Minimum rent-occupancy	$ 28,191	$ 25,110	$ 22,532
Contingent rent	787	687	618
Rent expense, occupancy	28,978	25,797	23,150
Minimum rent-equipment and other	3,502	3,393	3,013
Rent expense	$ 32,480	$ 29,190	$ 26,163