Schedule II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 150	$ 253	$ 293
Additions to Allowance	0	10	0
Charges Utilized/Write-offs	(77)	(113)	(40)
Balance at end of period	73	150	253
Valuation Allowance for Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	36,786	35,835	11,665
Additions to Allowance	1,643	951	24,170
Charges Utilized/Write-offs	(27,449)	0	0
Balance at end of period	$ 10,980	$ 36,786	$ 35,835