Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 253	$ 293	$ 82
Charged to costs and expenses	(113)	(40)	255
Deductions – write-offs of accounts	10	0	(44)
Balance at end of period	150	253	293
Valuation Allowance for Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	35,835	11,665	10,229
Charged to costs and expenses	951	24,170	1,436
Deductions – write-offs of accounts	0	0	0
Balance at end of period	$ 36,786	$ 35,835	$ 11,665