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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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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity, excluding depreciation and amortization expense. Gross margin is a non-GAAP financial measure.

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Restatement Charges

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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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.

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