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SEGMENT INFORMATION - Reconciliation of Adjusted EBITDA to Operating Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract] |  |  |  |
Operating income | $ 505,558 | $ 120,575 | $ 1,153,655 | $ 623,953
Share-based compensation expense | 12,327 | 15,005 | 46,176 | 40,932
Restructuring and other expense | 16,587 | 53,448 | 29,865 | 142,765
Depreciation and amortization (including impairments) | 536,053 | 823,286 | 1,827,285 | 2,138,800
Adjusted EBITDA | 1,070,525 | 1,012,314 | 3,056,981 | 2,946,450
Cablevision |  |  |  |
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract] |  |  |  |
Operating income | 340,455 | (3,103) | 714,413 | 228,740
Share-based compensation expense | 9,038 | 11,555 | 35,567 | 28,597
Restructuring and other expense | 14,122 | 35,364 | 25,720 | 105,182
Depreciation and amortization (including impairments) | 378,549 | 656,122 | 1,337,051 | 1,641,501
Adjusted EBITDA | 742,164 | 699,938 | 2,112,751 | 2,004,020
Cequel Corp. [Member] |  |  |  |
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract] |  |  |  |
Operating income | 165,103 | 123,678 | 439,242 | 395,213
Share-based compensation expense | 3,289 | 3,450 | 10,609 | 12,335
Restructuring and other expense | 2,465 | 18,084 | 4,145 | 37,583
Depreciation and amortization (including impairments) | 157,504 | 167,164 | 490,234 | 497,299
Adjusted EBITDA | $ 328,361 | $ 312,376 | $ 944,230 | $ 942,430

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