Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 30, 2018	Dec. 31, 2017	Dec. 25, 2016
Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts	$ 2,117	$ 2,271
Accounts receivable - affiliates, allowance for doubtful accounts	0	0
Notes receivable, allowance for doubtful accounts	0	0
Notes receivable, less current portion, allowance for doubtful accounts	$ 3,369	$ 1,047	$ 2,759
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	44,301,000	44,221,000
Treasury stock, shares	12,929,000	10,290,000