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SEGMENT INFORMATION - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | $ 11,820 | $ 11,526 | $ 35,908 | $ 32,902
Unallocated corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | 7,910 | 7,255 | 24,517 | 20,259
Compensation, benefits, and other employee-related expenses | 20,464 | 11,337 | 56,375 | 36,083
External consulting and other service expenses | 4,767 | 6,729 | 12,711 | 16,581
Information technology | 3,070 | 3,237 | 8,723 | 9,247
Depreciation | 1,639 | 2,288 | 5,058 | 6,378
Acquisition and integration | 1,122 | 1,327 | 15,678 | 2,539
Other general unallocated corporate | 4,962 | 2,674 | 9,225 | 8,965
Total unallocated corporate expense | $ 43,934 | $ 34,847 | $ 132,287 | $ 100,052

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