SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock Plans (Details) - Stock Option Plans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016
Defined Benefit Plan Disclosure [Line Items]
Shares of common stock available for issuance (in shares)	700,078		700,078
Compensation expense	$ 1,289	$ 1,468	$ 2,578	$ 2,959
Income tax benefits	$ 496	$ 565	$ 993	$ 1,139
Minimum
Defined Benefit Plan Disclosure [Line Items]
Vesting period of options			3 years
Expiration period of grant			6 years
Maximum
Defined Benefit Plan Disclosure [Line Items]
Vesting period of options			7 years
Expiration period of grant			10 years