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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Stock-Based Compensation |  |  |  |
Share-based compensation, remaining shares available for issuance (in shares) | 2,352,706 |  | 2,352,706 |
Engineering, Selling and Administrative Expense |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) | $ 1.9 | $ 2.3 | $ 5.6 | $ 5.4
Restricted Stock Units |  |  |  |
Stock-Based Compensation |  |  |  |
Granted (in shares) | 15,919 | 22,951 | 458,938 | 500,283
Restricted Stock Units | Director |  |  |  |
Stock-Based Compensation |  |  |  |
Granted (in shares) |  |  | 78,894 | 77,576
Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Granted (in shares) | 0 | 0 | 365,174 | 316,022
2013 Omnibus Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Share-based compensation, shares authorized (in shares) | 7,477,395 |  | 7,477,395 |
Performance Shares 2024 | 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 |
Percentage of shares of other than options granted during the period |  |  | 200.00% |
Performance Shares 2023 | 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
Percentage of shares of other than options granted during the period |  |  |  | 200.00%

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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