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INCOME TAXES - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2017	Sep. 28, 2016	Sep. 27, 2017	Sep. 28, 2016
Income Tax Disclosure [Abstract]
Document period end date			Sep. 27, 2017
Expected U.S. federal income taxes at statutory rate, percentage	35.00%	34.00%	35.00%	34.00%
Expected U.S. federal income taxes at statutory rate	$ 3,627	$ 3,139	$ 9,609	$ 7,734
State and local income taxes, net of federal benefit	$ 630	$ 533	$ 1,638	$ 1,277
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	6.10%	5.80%	6.00%	5.60%
Foreign withholding taxes	$ 292	$ 148	$ 705	$ 505
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	2.80%	1.60%	2.60%	2.20%
Tax credits	$ (399)	$ (243)	$ (777)	$ (369)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(3.80%)	(2.60%)	(2.80%)	(1.60%)
Non-controlling interest	$ (1,132)	$ (1,134)	$ (3,114)	$ (3,089)
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent	(10.90%)	(12.30%)	(11.30%)	(13.60%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ (524)	$ 0	$ (524)	$ 0
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(5.10%)		(2.00%)
Income tax expense	$ 2,494	$ 2,443	$ 7,537	$ 6,058
Effective income tax rate reconciliation (in percentage)	24.10%	26.50%	27.50%	26.60%

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