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Fair Value Measurements - Schedule of Fair Value of Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 15, 2019
Dec. 31, 2018
Nov. 30, 2017
Senior Notes Due 2026 | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of debt instrument $ 382,480   $ 372,000  
Interest rate, stated percentage 5.375%     5.375%
Senior Notes Due 2027 | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of debt instrument $ 498,750    
Interest rate, stated percentage 6.875% 6.875%    
Carrying Value | Senior Notes Due 2026 | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of debt instrument $ 392,369   391,630  
Carrying Value | Senior Notes Due 2027 | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of debt instrument 489,498    
Revolving Credit Facility | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of debt instrument 120,000   300,000  
Revolving Credit Facility | Carrying Value | Line of Credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of debt instrument $ 120,000   $ 300,000