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Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Reconciliation Net Income (Loss) to Gross Margin        
Total gross margin $ 108,268 $ 96,130 $ 213,376 $ 188,186
Less:        
Selling, general and administrative 26,649 25,162 54,157 52,715
Depreciation and amortization 43,331 47,248 87,786 95,020
Long-lived asset impairment 6,953 5,508 11,663 13,753
Restatement and other charges (1,076) 1,920 (591) 2,721
Restructuring and other charges 0 366 0 823
Interest expense 23,337 22,504 45,884 43,925
Debt extinguishment costs 2,450 0 2,450 291
Merger-related costs 5,686 0 9,811 0
Other income, net (1,644) (962) (2,789) (1,756)
Income (loss) before income taxes $ 2,582 $ (5,616) $ 5,005 $ (19,306)