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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Dec. 25, 2015
Advertising expense	$ 7,300	$ 7,800	$ 9,100
Impairment loss	0	65,869	0
Change in restricted cash	$ (21,505)	19,773	$ (18,374)
Minimum
Operating leases, renewal option period	3 years
Reporting Unit, percentage of fair value in excess of carrying amount	20.00%
Maximum
Operating leases, renewal option period	5 years
Building and Building Improvements
Useful life	40 years
Computers and software | Minimum
Useful life	3 years
Computers and software | Maximum
Useful life	10 years
Furniture and equipment | Minimum
Useful life	3 years
Furniture and equipment | Maximum
Useful life	10 years
Trade name/trademarks
Impairment of long-lived assets held-for-use		4,500
Customer Relationships
Impairment of intangible assets		28,900
CLP and Spartan | Trade name/trademarks
Impairment of intangible assets		$ 4,300

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