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v3.10.0.1

Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation Net Income (Loss) to Gross Margin |  |  |  |  |  |  |  |  |  |  |
Gross margin |  |  |  |  |  |  |  |  | $ 440,074 | $ 375,733 | $ 427,150
Less: |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative |  |  |  |  |  |  |  |  | 101,563 | 111,483 | 114,470
Depreciation and amortization |  |  |  |  |  |  |  |  | 174,946 | 188,563 | 208,986
Long-lived asset impairment | $ 9,804 | $ 6,660 | $ 6,953 | $ 4,710 | $ 8,284 | $ 7,105 | $ 5,508 | $ 8,245 | 28,127 | 29,142 | 87,435
Restatement and other charges | 214 | 396 | (1,076) | 485 | 1,083 | 566 | 1,920 | 801 | 19 | 4,370 | 13,470
Restructuring and other charges |  |  |  |  | 141 | 422 | 366 | 457 | 0 | 1,386 | 16,901
Interest expense |  |  |  |  |  |  |  |  | 93,328 | 88,760 | 83,899
Debt extinguishment loss | 0 | 0 | (2,450) | 0 | 0 | 0 | 0 | (291) | (2,450) | (291) | 0
Merger-related costs | $ 169 | $ 182 | $ 5,686 | $ 4,125 | $ 275 | $ 0 | $ 0 | $ 0 | 10,162 | 275 | 0
Other income, net |  |  |  |  |  |  |  |  | (5,831) | (5,918) | (8,590)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | $ 35,310 | $ (42,619) | $ (89,421)

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity, excluding depreciation and amortization expense. Gross margin is a non-GAAP financial measure. + References No definition available. + Details
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