Annual report pursuant to Section 13 and 15(d)

Leases (Minimum and Contingent Rent Exepense)(Details)

v3.8.0.1
Leases (Minimum and Contingent Rent Exepense)(Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 25, 2016
Dec. 27, 2015
Operating Leased Assets [Line Items]      
Total minimum and contingent rent $ 21,537 $ 18,382 $ 15,303
Related Parties [Member]      
Operating Leased Assets [Line Items]      
Miminum rent—related parties 2,215 1,988 1,901
Contingent rent—related parties 621 663 646
Total minimum and contingent rent 2,836 2,651 2,547
Unrelated Parties [Member]      
Operating Leased Assets [Line Items]      
Miminum rent—related parties 18,304 15,419 12,401
Contingent rent—related parties 397 312 355
Total minimum and contingent rent $ 18,701 $ 15,731 $ 12,756