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Reportable Segments and Geographic Information - Reconcilation from Net Income to Gross Margin (Details 4) - USD ($) $ in Thousands | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of net income to gross margin |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ (98,966) | $ 125,882 | $ 155,742
Selling, general and administrative | $ 600 |  |  |  |  |  |  |  | 131,919 | 132,651 | 118,851
Depreciation and amortization |  |  |  |  |  |  |  |  | 229,127 | 212,268 | 187,476
Long-lived asset impairment |  |  |  |  |  |  |  |  | 124,979 | 42,828 | 16,696
Restructuring and other charges |  |  |  |  |  |  |  |  | 4,745 | 5,394 | 0
Goodwill impairment |  | $ 3,700 |  |  |  |  |  |  | 3,738 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 107,617 | 112,273 | 112,194
Debt extinguishment costs |  |  |  |  |  |  |  |  | 9,201 | 0 | 0
Other (income) expense, net |  |  |  |  |  |  |  |  | (2,079) | (5,475) | (22,535)
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | 53,189 | (28,066) | (17,840)
Income from discontinued operations, net of tax |  | $ (8,300) | $ (13,700) | $ (34,900) | $ (45,000) | $ (32,600) | $ (24,000) | $ (41,400) | (60,408) | (142,995) | (158,790)
Gross margin |  |  |  |  |  |  |  |  | $ 503,062 | $ 454,760 | $ 391,794

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