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Reportable Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Reconciliation Net Income (Loss) to Gross Margin |  |
Gross margin | $ 92,056 | $ 114,754
Less: |  |
Selling, general and administrative | 27,553 | 34,651
Depreciation and amortization | 47,772 | 53,927
Long-lived asset impairment | 8,245 | 9,860
Restatement and other charges | 801 | 0
Restructuring and other charges | 457 | 8,065
Interest expense | 21,421 | 20,300
Debt extinguishment costs | 291 | 0
Other income, net | (794) | (1,989)
Loss before income taxes | $ (13,690) | $ (10,060)

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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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