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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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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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