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Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation Net Income (Loss) to Gross Margin
Gross margin									$ 440,074	$ 375,733	$ 427,150
Less:
Selling, general and administrative									101,563	111,483	114,470
Depreciation and amortization									174,946	188,563	208,986
Long-lived asset impairment	$ 9,804	$ 6,660	$ 6,953	$ 4,710	$ 8,284	$ 7,105	$ 5,508	$ 8,245	28,127	29,142	87,435
Restatement and other charges	214	396	(1,076)	485	1,083	566	1,920	801	19	4,370	13,470
Restructuring and other charges					141	422	366	457	0	1,386	16,901
Interest expense									93,328	88,760	83,899
Debt extinguishment loss	0	0	(2,450)	0	0	0	0	(291)	(2,450)	(291)	0
Merger-related costs	$ 169	$ 182	$ 5,686	$ 4,125	$ 275	$ 0	$ 0	$ 0	10,162	275	0
Other income, net									(5,831)	(5,918)	(8,590)
Income (loss) before income taxes									$ 35,310	$ (42,619)	$ (89,421)

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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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