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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

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