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Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 24, 2020
May 14, 2019
Feb. 21, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Mar. 25, 2019
Mar. 22, 2019
Mar. 01, 2018
Nov. 02, 2017
Debt Instrument [Line Items]                            
Amount that can be authorized without making an offer to buy back debt                     $ 299,401,000      
Special cash dividend   $ 230,000,000.0                        
Loss on early extinguishment of debt         $ 0 $ 0 $ 9,800,000 $ 0 $ 9,756,000          
Repayment of debt               0 $ 140,272,000          
Outstanding debt         379,722,000     379,722,000   $ 339,189,000        
Cash and cash equivalents         216,413,000     216,413,000   $ 193,383,000        
Senior Secured Notes | Senior Secured Notes Due 2024, Existing Notes                            
Debt Instrument [Line Items]                            
Face amount of debt                           $ 350,000,000.0
Stated interest rate                           8.00%
Senior Secured Notes | Senior Secured Notes Due 2024, New Notes                            
Debt Instrument [Line Items]                            
Face amount of debt                         $ 125,000,000.0  
Senior Secured Notes | Senior Secured Notes Due 2024, Existing Notes, Restricted Payment Offer                            
Debt Instrument [Line Items]                            
Stated interest rate                         8.00%  
Maximum amount available for repurchase     $ 150,000,000                      
Redemption price, percentage     103.00%                      
Debt instrument, amount validly tendered and not withdrawn                       $ 1,900,000    
Pro-ration factor (as a percent)                       31.5789%    
Purchase integrals                       $ 1,000    
Senior Secured Notes | Senior Secured Notes Due 2024, Tendered Notes, Restricted Payment Pro-Rated Offer                            
Debt Instrument [Line Items]                            
Debt instrument, amount validly tendered and not withdrawn                       599,000    
Debt instrument, amount accepted                       599,000    
Debt instrument, not accepted                       1,301,000    
Senior Secured Notes | Senior Secured Notes Due 2024, Existing Notes, Tender Offer                            
Debt Instrument [Line Items]                            
Maximum amount available for repurchase     $ 150,000,000                      
Redemption price, percentage     104.25%                      
Debt instrument, amount validly tendered and not withdrawn                       $ 415,099,000    
Pro-ration factor (as a percent)                       31.5789%    
Purchase integrals                       $ 1,000    
Senior Secured Notes | Senior Secured Notes Due 2024, Tendered Notes, Tender Offer Pro-Rated Offer                            
Debt Instrument [Line Items]                            
Debt instrument, amount validly tendered and not withdrawn                       130,966,000    
Debt instrument, amount accepted                       130,966,000    
Debt instrument, not accepted                       $ 284,133,000    
ABL Borrowings | ABL Facility                            
Debt Instrument [Line Items]                            
Amount of borrowings available         64,000,000.0     64,000,000.0            
Citibank | ABL Borrowings                            
Debt Instrument [Line Items]                            
Borrowings under ABL Facility $ 70,000,000.0                          
Repayment of debt       $ 30,000,000.0                    
Outstanding debt         $ 40,000,000.0     $ 40,000,000.0