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Long-Term Obligations 6.750% Senior Notes Due 2025 (Details) - Senior Notes - 2025 Notes - USD ($)
May 23, 2017
Dec. 31, 2018
Jun. 30, 2018
Debt Instrument [Line Items]      
Debt instrument, face amount $ 250,000,000.0    
Debt instrument, interest rate, stated percentage 6.75% 6.75%  
Debt instrument, redemption price, percentage of principal amount redeemed 35.00%    
Line of credit facility, amount outstanding   $ 250,000,000.0 $ 250,000,000
Deferred financing costs   (4,800,000)  
Debt discount   $ (1,500,000)  
Prior to May 15, 2020      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount redeemed 106.75%    
Twelve-Month Period Beginning on May 15, 2020      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount redeemed 105.063%    
Twelve-Month Period Beginning on May 15, 2021      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount redeemed 103.375%    
Twelve-Month Period Beginning on May 15, 2022      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount redeemed 101.688%    
Twelve-Month Period Beginning on May 15, 2023      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount redeemed 100.00%    
Debt Instrument, Redemption, Change Of Control      
Debt Instrument [Line Items]      
Debt instrument, redemption price, percentage of principal amount redeemed 101.00%