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Operating Segments and Geographic Information - Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2016 | Oct. 02, 2016 | Jul. 03, 2016 | Apr. 03, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  | $ 45,600 | $ 47,200 | $ 46,600
Amortization of intangibles |  |  |  |  |  |  |  |  | 103,997 | 98,385 | 103,791
Severance, restructuring, and acquisition integration costs | $ 9,900 | $ 16,700 | $ 9,600 | $ 6,600 | $ 11,700 | $ 12,800 | $ 5,900 | $ 8,400 | 42,790 | 38,770 | 47,170
Patent settlement |  |  |  |  | (10,300) |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 64,261 | 53,974 | 54,969
Segment assets | 3,840,613 |  |  |  | 3,806,803 |  |  |  | 3,840,613 | 3,806,803 | 3,290,602
Broadcast Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 5,532 | 10,414 | 39,078
Enterprise Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 23,511 | 11,962 | 723
Industrial Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 12,272 | 9,923 | 6,228
Network Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 1,475 | 6,471 | 1,141
Reportable Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 2,388,643 | 2,357,805 | 2,360,583
Affiliate revenues |  |  |  |  |  |  |  |  | 9,362 | 8,125 | 7,929
Segment EBITDA |  |  |  |  |  |  |  |  | 430,034 | 433,189 | 401,666
Depreciation expense |  |  |  |  |  |  |  |  | 45,597 | 47,208 | 46,551
Amortization of intangibles |  |  |  |  |  |  |  |  | 103,997 | 98,385 | 103,791
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 42,790 | 38,770 | 47,170
Purchase accounting effects of acquisitions |  |  |  |  |  |  |  |  | 6,133 | (2,079) | 9,747
Deferred gross profit adjustments |  |  |  |  |  |  |  |  | 0 | 6,687 | 52,876
Patent settlement |  |  |  |  |  |  |  |  | 0 | (5,554) | 0
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 62,759 | 53,582 | 53,572
Segment assets | 1,146,395 |  |  |  | 913,998 |  |  |  | 1,146,395 | 913,998 | 934,280
Reportable Segment [Member] | Broadcast Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 725,139 | 769,753 | 739,970
Affiliate revenues |  |  |  |  |  |  |  |  | 440 | 744 | 916
Segment EBITDA |  |  |  |  |  |  |  |  | 112,849 | 137,870 | 113,638
Depreciation expense |  |  |  |  |  |  |  |  | 15,763 | 16,229 | 16,295
Amortization of intangibles |  |  |  |  |  |  |  |  | 49,325 | 47,248 | 49,812
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 5,532 | 10,414 | 39,078
Purchase accounting effects of acquisitions |  |  |  |  |  |  |  |  | 6,133 | (2,991) | 132
Deferred gross profit adjustments |  |  |  |  |  |  |  |  | 0 | 1,774 | 2,446
Patent settlement |  |  |  |  |  |  |  |  | 0 | (5,554) | 0
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 21,314 | 15,713 | 27,365
Segment assets | 405,842 |  |  |  | 325,396 |  |  |  | 405,842 | 325,396 | 346,095
Reportable Segment [Member] | Enterprise Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 631,166 | 603,188 | 605,910
Affiliate revenues |  |  |  |  |  |  |  |  | 7,385 | 5,977 | 5,322
Segment EBITDA |  |  |  |  |  |  |  |  | 103,650 | 101,298 | 100,214
Depreciation expense |  |  |  |  |  |  |  |  | 10,509 | 13,226 | 12,591
Amortization of intangibles |  |  |  |  |  |  |  |  | 1,729 | 1,718 | 1,720
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 23,511 | 11,962 | 723
Purchase accounting effects of acquisitions |  |  |  |  |  |  |  |  | 0 | 912 | 52
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 28,126 | 22,679 | 10,323
Segment assets | 282,072 |  |  |  | 246,564 |  |  |  | 282,072 | 246,564 | 238,400
Reportable Segment [Member] | Industrial Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 628,458 | 585,476 | 603,350
Affiliate revenues |  |  |  |  |  |  |  |  | 1,441 | 1,325 | 1,613
Segment EBITDA |  |  |  |  |  |  |  |  | 119,642 | 101,248 | 99,941
Depreciation expense |  |  |  |  |  |  |  |  | 12,968 | 11,038 | 11,235
Amortization of intangibles |  |  |  |  |  |  |  |  | 2,571 | 2,394 | 3,154
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 12,272 | 9,923 | 6,228
Purchase accounting effects of acquisitions |  |  |  |  |  |  |  |  | 0 | 0 | 334
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 8,151 | 10,486 | 8,836
Segment assets | 300,172 |  |  |  | 226,306 |  |  |  | 300,172 | 226,306 | 231,265
Reportable Segment [Member] | Network Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 403,880 | 399,388 | 411,353
Affiliate revenues |  |  |  |  |  |  |  |  | 96 | 79 | 78
Segment EBITDA |  |  |  |  |  |  |  |  | 93,893 | 92,773 | 87,873
Depreciation expense |  |  |  |  |  |  |  |  | 6,357 | 6,715 | 6,430
Amortization of intangibles |  |  |  |  |  |  |  |  | 50,372 | 47,025 | 49,105
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 1,475 | 6,471 | 1,141
Purchase accounting effects of acquisitions |  |  |  |  |  |  |  |  | 0 | 0 | 9,229
Deferred gross profit adjustments |  |  |  |  |  |  |  |  | 0 | 4,913 | 50,430
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 5,168 | 4,704 | 7,048
Segment assets | $ 158,309 |  |  |  | $ 115,732 |  |  |  | 158,309 | 115,732 | 118,520
Software Development [Member] | Reportable Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangibles |  |  |  |  |  |  |  |  | 56 | 0 | 0
Software Development [Member] | Reportable Segment [Member] | Broadcast Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangibles |  |  |  |  |  |  |  |  | $ 56 | $ 0 | $ 0

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