Annual report pursuant to Section 13 and 15(d)

Gain on insurance settlements (Details)

v3.8.0.1
Gain on insurance settlements (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 25, 2016
Dec. 27, 2015
Gain on insurance settlements [Abstract]        
Insurance settlements   $ 2,262    
Proceeds from insurance settlements $ 1,000      
Insurance Settlements Receivable 1,300 1,300    
Costs and expenses   460    
Assets disposed, net 440 440    
Gain on insurance settlements $ (1,400) $ (1,362) $ 0 $ 0