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Fair Value Measurements (Narrative) (Details)
Jun. 30, 2019
Jun. 26, 2019
Dec. 31, 2018
Term loan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading prices rate to calculate the fair value 99.90%   95.13%
6.75% Senior Notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading prices rate to calculate the fair value 99.63%    
Senior Notes | 6.75% Senior Notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate   6.75%