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Fair Value Measurements - Summary of Assets and Liabilities Carried at Book Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value $ 277,873 $ 272,751
Senior Notes due 2024    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value [1] 227,414 226,885
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 228,824 228,585
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 228,824 228,585
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]    
Net unamortized debt issuance costs $ 2,600 3,100
Revolving Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 2.70%  
Net unamortized debt issuance costs $ 1,700 $ 2,300
Book value $ 20,000  
[1] Net of unamortized debt issuance costs of $2.6 million and $3.1 million at September 30, 2020 and December 31, 2019, respectively.
[2] Unamortized debt issuance costs of $1.7 million and $2.3 million at September 30, 2020 and December 31, 2019, respectively, included in Other Non-Current Assets.