Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 25, 2016
Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts	$ 2,271	$ 1,486
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	$ 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	44,221,000	44,066,000
Treasury stock, shares	10,290,000	7,383,000