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Debt - Summary of Total Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt issuance costs $ (24,350) $ (13,203)
Total debt 1,386,185 671,756
Less: current portion of term loans 34,089 20,767
Less: current portion of debt issuance costs (4,861) (2,980)
Total long-term debt 1,352,096 650,989
Term Loans    
Debt Instrument [Line Items]    
Total debt 775,535 284,959
Less: current portion of term loans 38,950 23,747
Line of Credit | Revolving Credit Facility    
Debt Instrument [Line Items]    
Total debt 235,000 0
Senior Notes | 5.750% Senior Notes, due August 2026    
Debt Instrument [Line Items]    
Total debt $ 400,000 $ 400,000