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Reportable Segments (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Reconciliation of net income to gross margin |  |
Net income | $ 34,894 | $ 58,791
Selling, general and administrative | 92,578 | 84,874
Depreciation and amortization | 85,522 | 82,646
Long-lived asset impairment | 3,807 | 3,563
Restructuring charges | 4,822 |
Interest expense | 28,308 | 27,874
Equity in income of non-consolidated affiliates | (4,693) | (4,665)
Other (income) expense, net | (2,434) | (9,808)
Provision for income taxes | 9,409 | 14,983
Income from discontinued operations, net of tax | (18,727) | (33,516)
Gross margin | $ 233,486 | $ 224,742

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