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Reportable Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reconciliation Net Income (Loss) to Gross Margin |  |  |  |
Total gross margin | $ 87,416 | $ 103,323 | $ 275,602 | $ 329,003
Less: |  |  |  |
Selling, general and administrative | 29,108 | 25,448 | 81,823 | 87,745
Depreciation and amortization | 47,463 | 52,068 | 142,483 | 157,891
Long-lived asset impairment | 7,105 | 16,713 | 20,858 | 40,381
Restatement and other charges | 566 | 426 | 3,287 | 860
Restructuring and other charges | 422 | 4,689 | 1,245 | 15,758
Interest expense | 22,892 | 21,365 | 66,817 | 62,842
Debt extinguishment costs | 0 | 0 | 291 | 0
Other income, net | (2,716) | (2,470) | (4,472) | (4,640)
Loss before income taxes | $ (17,424) | $ (14,916) | $ (36,730) | $ (31,834)

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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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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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