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Reportable Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Reconciliation Net Income (Loss) to Gross Margin |  |  |  |
Income (loss) before income taxes | $ 110,926 | $ 127,997 | $ 225,680 | $ 257,414
Less: |  |  |  |
Selling, general and administrative | 28,080 | 31,357 | 62,731 | 63,925
Depreciation and amortization | 51,896 | 57,539 | 105,823 | 114,552
Long-lived asset impairment | 13,808 | 9,510 | 23,668 | 17,663
Restructuring and other charges | 3,004 | 1,193 | 11,069 | 1,193
Interest expense | 21,177 | 28,079 | 41,477 | 54,870
Other income, net | (181) | (2,482) | (2,170) | (3,032)
Income (loss) before income taxes | $ (6,858) | $ 2,801 | $ (16,918) | $ 8,243

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