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Supplemental Guarantor Information - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 15, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]        
Repayment of debt   $ 381,895 $ 21,685  
4.375% Senior notes due June 15, 2019 | Senior Notes        
Condensed Financial Statements, Captions [Line Items]        
Repayment of debt $ 381,900     $ 68,100