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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 12 Months Ended
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Jan. 01, 2017
Equity [Abstract] |
Schedule of Comprehensive Income (Loss) | Changes in the balance of each component of accumulated other comprehensive income (loss) during the years ended December 31, 2017 and January 1, 2017 were as follows:
| Years ended
| December 31, 2017 |  | January 1, 2017
(in thousands) | Balance at beginning of period | Current period other comprehensive income | Balance at end of period |  | Balance at beginning of period | Current period other comprehensive income | Balance at end of period
Foreign currency translation adjustment | $ | (11,684 | ) | $ | 3,355 |  | $ | (8,329 | ) |  | $ | (13,514 | ) | $ | 1,830 |  | $ | (11,684 | )
Unrealized gain (loss) on investments (1) | 251 |  | 1,274 |  | 1,525 |  |  | (499 | ) | 750 |  | 251 |
Total other comprehensive income (loss), net of tax | $ | (11,433 | ) | $ | 4,629 |  | $ | (6,804 | ) |  | $ | (14,013 | ) | $ | 2,580 |  | $ | (11,433 | )
(1) | Consists of deferred compensation plan accounts, which are comprised of mutual funds classified as available-for-sale securities. The tax impact on unrealized gain on available-for-sale securities was $0.5 million for fiscal 2017 and de minimis for fiscal 2016.

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e526-108580 + Details
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