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Stock-Based Compensation - Long-Term Incentive Plan Awards (Details) - LTIP PSUs - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issued (in shares) | 38,174 | 41,793 |
Additional awards expected to vest (in shares) |  |  | 86,360
Unrecognized stock compensation expense |  |  | $ 6,098
Selling, General and Administrative Expenses |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expenses |  |  | $ 7,261

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