SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock Plans (Details) - Stock Option Plans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Defined Benefit Plan Disclosure [Line Items]
Shares of common stock available for issuance (in shares)	874,352		874,352
Compensation expense	$ 1,468	$ 1,303	$ 2,959	$ 2,653
Income tax benefits	$ 565	$ 501	$ 1,139	$ 1,021
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