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Fair Value Measurements - Summary of Assets and Liabilities Carried at Book Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
May 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Book value $ 411,042 $ 253,427  
Senior Notes due 2024      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Book value [1] 0 227,590  
Revolving Credit Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Book value [2] 20,000 0  
Portion at Other than Fair Value Measurement | Senior Notes due 2024      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 354,873 229,874  
Portion at Other than Fair Value Measurement | Senior Notes due 2024 | Level 1      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 0 0  
Portion at Other than Fair Value Measurement | Senior Notes due 2024 | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 354,873 229,874  
Portion at Other than Fair Value Measurement | Senior Notes due 2024 | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 0 0  
Portion at Other than Fair Value Measurement | Revolving Credit Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 20,000 0  
Portion at Other than Fair Value Measurement | Revolving Credit Facility | Level 1      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 0 0  
Portion at Other than Fair Value Measurement | Revolving Credit Facility | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt 20,000 0  
Portion at Other than Fair Value Measurement | Revolving Credit Facility | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of long-term debt $ 0 0  
Senior Notes due 2024      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated interest rate 5.125%   5.875%
Net unamortized debt issuance costs $ 0 2,400  
Revolving Credit Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Net unamortized debt issuance costs $ 2,500 $ 1,500  
[1] Net of unamortized debt issuance costs of $0.0 million and $2.4 million at September 30, 2021 and December 31, 2020, respectively.
[2] Unamortized debt issuance costs of $2.5 million and $1.5 million at September 30, 2021 and December 31, 2020, respectively, included in Other Non-Current Assets