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Long-Term Obligations - 6.75% Senior Notes Due 2025 (Details) - Senior Notes - Senior 2025 Notes - USD ($)
3 Months Ended
May 23, 2017
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Face amount of debt $ 250,000,000.0    
Interest rate (as percent) 6.75%    
Purchase price (as percent)   101.00%  
Long-term Line of Credit   $ 250,000,000.0  
Debt Instrument, Interest Rate, Effective Percentage   7.25%  
Deferred financing costs   $ 3,100,000 $ 3,300,000
Debt discount   $ 1,000,000.0 $ 1,000,000.0
Twelve-month period beginning on May 15, 2020      
Debt Instrument [Line Items]      
Redemption price (as percent) 105.063%    
Twelve-month period beginning on May 15, 2021      
Debt Instrument [Line Items]      
Redemption price (as percent) 103.375%    
Twelve-month period beginning on May 15, 2022      
Debt Instrument [Line Items]      
Redemption price (as percent) 101.688%    
Beginning on May 15, 2023 and thereafter      
Debt Instrument [Line Items]      
Redemption price (as percent) 100.00%