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Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reconciliation Net Income (Loss) to Gross Margin |  |  |  |
Total gross margin | $ 125,654 | $ 108,268 | $ 243,176 | $ 213,376
Less: |  |  |  |
Selling, general and administrative | 28,618 | 26,649 | 57,607 | 54,157
Depreciation and amortization | 45,482 | 43,331 | 89,588 | 87,786
Long-lived asset impairment | 8,632 | 6,953 | 11,724 | 11,663
Restatement and other charges | 24 | (1,076) | 445 | (591)
Interest expense | 25,954 | 23,337 | 49,571 | 45,884
Debt extinguishment loss | 3,653 | 2,450 | 3,653 | 2,450
Transaction-related costs | 2,687 | 5,686 | 2,867 | 9,811
Other income, net | (2,010) | (1,644) | (2,215) | (2,789)
Income before income taxes | $ 12,614 | $ 2,582 | $ 29,936 | $ 5,005

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