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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Stock-Based Compensation |  |  |  |
Share-based compensation, remaining shares available for issuance (in shares) | 3,918,624 |  | 3,918,624 |
Engineering, Selling and Administrative Expense |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) | $ 1.5 | $ 1.6 | $ 5.6 | $ 6.4
Director |  |  |  |
Stock-Based Compensation |  |  |  |
Number of share options granted during the period (in shares) | 0 | 0 | 56,640 | 56,672
Restricted Stock Units |  |  |  |
Stock-Based Compensation |  |  |  |
Granted (in shares) | 13,476 | 22,581 | 356,388 | 340,305
Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Granted (in shares) | 0 | 0 | 198,334 | 203,697
2013 Omnibus Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Share-based compensation, shares authorized (in shares) | 7,477,395 |  | 7,477,395 |
Performance Shares 2022 | Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Percentage of shares paid based on total shareholder return relative to peer group (as a percent) |  |  | 60.00% |
Percentage of shares paid based on adjusted EBITDA (as a percent) |  |  | 40.00% |
Increase decrease in percentage of shares paid based on total shareholder return relative to defined peer group |  |  | 20.00% |
Performance period (in years) |  |  | 3 years |
Performance Shares 2021 | Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Percentage of shares paid based on total shareholder return relative to peer group (as a percent) |  |  |  | 60.00%
Percentage of shares paid based on adjusted EBITDA (as a percent) |  |  |  | 40.00%
Increase decrease in percentage of shares paid based on total shareholder return relative to defined peer group |  |  |  | 20.00%
Performance period (in years) |  |  | 3 years | 3 years
Percentage of shares of other than options granted during the period |  |  | 200.00% |
Performance Shares 2020 | Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Percentage of shares paid based on total shareholder return relative to peer group (as a percent) |  |  |  | 200.00%
Performance period (in years) |  |  |  | 3 years

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