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SEGMENT INFORMATION - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | $ 14,025 | $ 11,820 | $ 43,429 | $ 35,908
Unallocated corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | 8,752 | 7,910 | 27,744 | 24,517
Compensation, benefits, and other employee-related expenses | 18,770 | 20,464 | 54,561 | 56,375
External consulting and other service expenses | 4,156 | 4,767 | 12,060 | 12,711
Information technology | 3,534 | 3,070 | 10,811 | 8,723
Depreciation | 975 | 1,639 | 3,256 | 5,058
Acquisition and integration | 5,679 | 1,122 | 23,621 | 15,678
Other general unallocated corporate | 3,965 | 4,962 | 8,421 | 9,225
Total unallocated corporate expense | $ 45,831 | $ 43,934 | $ 140,474 | $ 132,287

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