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Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Reconciliation Net Income (Loss) to Gross Margin    
Total gross margin $ 117,522 $ 105,108
Less:    
Selling, general and administrative 28,989 27,508
Depreciation and amortization 44,106 44,455
Long-lived asset impairment 3,092 4,710
Restatement and other charges 421 485
Interest expense 23,617 22,547
Merger-related costs 180 4,125
Other income, net (205) (1,145)
Income before income taxes $ 17,322 $ 2,423