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Operating Segments - Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation expense | $ 11,700 | $ 11,700 | $ 35,600 | $ 34,600 |
Amortization of intangibles | 25,533 | 27,162 | 74,990 | 77,944 |
Severance, restructuring, and acquisition integration costs | 11,688 | 16,679 | 57,010 | 32,839 |
Segment assets | 3,714,912 |  | 3,714,912 |  | $ 3,840,613
Enterprise Solutions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Severance, restructuring, and acquisition integration costs | 9,528 | 9,309 | 46,949 | 23,701 |
Industrial Solutions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Severance, restructuring, and acquisition integration costs | 2,160 | 7,370 | 10,061 | 9,138 |
Reportable Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 659,003 | 621,745 | 1,937,867 | 1,783,759 |
Affiliate revenues | 1,791 | 973 | 4,379 | 4,135 |
Segment EBITDA | 125,960 | 117,856 | 353,344 | 321,748 |
Depreciation expense | 11,671 | 11,683 | 35,562 | 34,594 |
Amortization of intangibles | 25,533 | 27,162 | 74,990 | 77,944 |
Amortization of software development intangible assets | 620 | 0 | 1,344 | 0 |
Severance, restructuring, and acquisition integration costs | 11,688 | 16,679 | 57,010 | 32,839 |
Purchase accounting effects of acquisitions | 821 | 2,922 | 2,359 | 4,089 |
Deferred revenue adjustments | 3,229 | 0 | 7,889 | 0 |
Segment assets | 1,215,131 | 1,058,713 | 1,215,131 | 1,058,713 |
Reportable Segment | Enterprise Solutions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 392,080 | 360,842 | 1,142,765 | 1,023,924 |
Affiliate revenues | 1,776 | 971 | 4,318 | 4,084 |
Segment EBITDA | 72,210 | 62,109 | 199,943 | 168,073 |
Depreciation expense | 7,092 | 6,828 | 21,465 | 20,129 |
Amortization of intangibles | 12,322 | 13,920 | 35,301 | 38,241 |
Amortization of software development intangible assets | 620 |  | 1,344 |  |
Severance, restructuring, and acquisition integration costs | 9,528 | 9,309 | 46,949 | 23,701 |
Purchase accounting effects of acquisitions | 821 | 2,922 | 2,359 | 4,089 |
Deferred revenue adjustments | 3,229 |  | 7,889 |  |
Segment assets | 766,505 | 658,175 | 766,505 | 658,175 |
Reportable Segment | Industrial Solutions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 266,923 | 260,903 | 795,102 | 759,835 |
Affiliate revenues | 15 | 2 | 61 | 51 |
Segment EBITDA | 53,750 | 55,747 | 153,401 | 153,675 |
Depreciation expense | 4,579 | 4,855 | 14,097 | 14,465 |
Amortization of intangibles | 13,211 | 13,242 | 39,689 | 39,703 |
Amortization of software development intangible assets | 0 |  | 0 |  |
Severance, restructuring, and acquisition integration costs | 2,160 | 7,370 | 10,061 | 9,138 |
Purchase accounting effects of acquisitions | 0 | 0 | 0 | 0 |
Deferred revenue adjustments | 0 |  | 0 |  |
Segment assets | $ 448,626 | $ 400,538 | $ 448,626 | $ 400,538 |

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