Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 27, 2015	Dec. 28, 2014
Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts	$ 2,447	$ 3,814
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	$ 3,653	$ 3,132
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	43,731	43,331
Treasury stock, shares	5,308	3,549