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Operating Segments and Geographic Information - Operating Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 1,862,716 | $ 2,131,278 | $ 2,165,702
Depreciation expense | 42,500 | 40,400 | 38,300
Amortization of intangibles | 64,395 | 74,609 | 75,140
Severance, restructuring, and acquisition integration costs | 12,258 | 26,544 | 22,625
Acquisition of property, plant and equipment | 90,215 | 110,002 | 97,847
Segment assets | 3,139,734 | 3,406,759 | 3,779,321
Enterprise Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 872,417 | 946,041 | 957,501
Severance, restructuring, and acquisition integration costs | 7,719 | 10,808 | 14,863
Industrial Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 990,299 | 1,185,237 | 1,208,201
Severance, restructuring, and acquisition integration costs | 4,539 | 15,736 | 7,762
Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,862,716 | 2,131,278 | 2,165,702
Segment EBITDA | 246,959 | 353,035 | 394,660
Depreciation expense | 42,470 | 40,409 | 38,309
Amortization of intangibles | 64,395 | 74,609 | 75,140
Amortization of software development intangible assets | 1,821 | 525 | 79
Severance, restructuring, and acquisition integration costs | 12,258 | 26,544 | 22,625
Purchase accounting effects of acquisitions | 125 | 592 | 1,690
Acquisition of property, plant and equipment | 69,898 | 77,478 | 72,153
Segment assets | 985,252 | 991,607 | 938,971
Reportable Segment | Enterprise Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment EBITDA | 99,333 | 126,925 | 156,790
Depreciation expense | 20,655 | 19,771 | 18,490
Amortization of intangibles | 21,662 | 22,324 | 21,076
Severance, restructuring, and acquisition integration costs | 7,720 | 10,808 | 14,863
Purchase accounting effects of acquisitions | 125 | 592 | 1,690
Acquisition of property, plant and equipment | 25,223 | 42,289 | 42,624
Segment assets | 462,615 | 487,125 | 430,128
Reportable Segment | Industrial Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment EBITDA | 147,626 | 226,110 | 237,870
Depreciation expense | 21,815 | 20,638 | 19,819
Amortization of intangibles | 42,733 | 52,285 | 54,064
Severance, restructuring, and acquisition integration costs | 4,538 | 15,736 | 7,762
Acquisition of property, plant and equipment | 44,675 | 35,189 | 29,529
Segment assets | 522,637 | 504,482 | 508,843
Software Development | Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of intangibles | 1,821 | 525 | 79
Software Development | Reportable Segment | Enterprise Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of software development intangible assets | 245 | 175 | 71
Software Development | Reportable Segment | Industrial Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Amortization of software development intangible assets | 1,576 | 350 | 8
Segment revenues | Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,862,716 | 2,131,278 | 2,165,702
Segment revenues | Reportable Segment | Enterprise Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 872,415 | 946,041 | 957,501
Segment revenues | Reportable Segment | Industrial Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 990,301 | 1,185,237 | 1,208,201
Affiliate revenues | Reportable Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,349 | 4,173 | 6,185
Affiliate revenues | Reportable Segment | Enterprise Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,289 | 4,162 | 6,105
Affiliate revenues | Reportable Segment | Industrial Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 60 | $ 11 | $ 80

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