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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Stock Option Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Shares of common stock available for issuance (in shares) | 1,700,000 |  | 1,700,000 |
Compensation expense | $ 2,599 | $ 2,096 | $ 5,374 | $ 4,590
Income tax benefits | $ 650 | $ 807 | $ 1,344 | $ 1,767
Stock Option Plans | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Vesting period of options |  |  | 3 years |
Expiration period of grant |  |  | 6 years |
Stock Option Plans | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Vesting period of options |  |  | 7 years |
Expiration period of grant |  |  | 10 years |
Restricted Stock Units (RSUs) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Vesting period of options |  |  | 3 years |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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