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Fair Value Measurements - Summary of Assets and Liabilities Carried at Book Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value $ 321,443 $ 272,751
Senior Notes due 2024    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value [1] 227,238 226,885
Revolving Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Book value [2] 60,000 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 220,676 228,585
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 220,676 228,585
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 60,000 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 60,000 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 $ 2,800 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 $ 1,900 $ 2,300
Book value $ 60,000  
[1] Net of unamortized debt issuance costs of $2.8 million and $3.1 million at June 30, 2020 and December 31, 2019, respectively.
[2] Unamortized debt issuance costs of $1.9 million and $2.3 million at June 30, 2020 and December 31, 2019, respectively, included in Other Non-Current Assets.