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Reportable Segments (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Reconciliation of net income to gross margin |  |  |  |
Net income | $ 7,789 | $ 20,863 | $ 48,874 | $ 55,757
Selling, general and administrative | 83,874 | 95,712 | 170,560 | 188,290
Depreciation and amortization | 94,325 | 111,956 | 190,133 | 197,478
Long-lived asset impairment | 15,420 | 9,847 | 28,152 | 13,654
Restructuring and other charges | 19,604 | 353 | 24,394 | 5,175
Interest expense | 28,398 | 32,722 | 55,696 | 61,030
Equity in income of non-consolidated affiliates | (5,062) | (4,909) | (10,068) | (9,602)
Other (income) expense, net | 1,005 | (3,671) | 8,846 | (6,105)
Provision for income taxes | 1,742 | 10,870 | 18,233 | 20,279
Income from discontinued operations, net of tax | (254) | (17,769) | (18,967) | (36,496)
Gross margin | $ 246,841 | $ 255,974 | $ 515,853 | $ 489,460

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