SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 6,661	$ 9,381	$ 2,525
Additions, Charged to Operating Results	2,683	1,172	1,201
Additions, Charged to Other Accounts	339	(452)	6,087
Deductions	1,538	3,440	432
Ending Balance	8,145	6,661	9,381
Allowance for Sales Adjustments
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	4,874	5,662	7,425
Additions, Charged to Operating Results	185,198	199,423	150,113
Additions, Charged to Other Accounts	0	0	0
Deductions	180,595	200,211	151,876
Ending Balance	9,477	4,874	5,662
Valuation Allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	25,611	27,300	9,150
Additions, Charged to Operating Results	0	0	0
Additions, Charged to Other Accounts	0	0	19,379
Deductions	(11,132)	(1,689)	(1,229)
Ending Balance	$ 14,479	$ 25,611	$ 27,300

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

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