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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-Based Compensation |  |  |
Share-based compensation, remaining shares available for issuance (in shares) | 4,691,191 |  |
Stock-based compensation expense (in dollars) | $ 6.0 |  |
Director |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) | $ 1.0 | $ 1.0 | $ 1.1
Number of share options granted during the period (in shares) | 77,608 | 50,673 | 25,021
Engineering Selling and Administrative Expenses |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) | $ 8.5 | $ 9.5 | $ 7.5
Restricted Stock | Restructuring Charges |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) | 2.5 | 0.7 |
Stock Options |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) | $ 1.3 | $ 2.7 | $ 2.4
Number of share options granted during the period (in shares) | 250,432 | 210,243 | 187,484
Weighted average grant date fair value, options (in dollars per share) | $ 5.35 | $ 8.07 | $ 15.66
Unrecognized compensation expense before income tax (in dollars) | $ 0.8 |  |
Recognition period for unrecognized compensation expense (in years) | 1 year 4 months 24 days |  |
Stock Options | Employees |  |  |
Stock-Based Compensation |  |  |
Vesting period (in years) | 3 years |  |
Expiration period (in years) | 10 years |  |
Restricted Stock Units |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) | $ 3.5 | $ 2.4 | $ 1.5
Unrecognized compensation expense before income tax (in dollars) | $ 2.6 |  |
Recognition period for unrecognized compensation expense (in years) | 1 year 9 months 18 days |  |
Number of shares of other than options granted during the period (in shares) | 333,269 | 178,371 | 86,692
Restricted Stock Units | Employees |  |  |
Stock-Based Compensation |  |  |
Vesting period (in years) | 3 years |  |
Options vesting percentage | 100.00% |  |
Vesting rights, annual increments beginning on the grant date | 100% on the third anniversary of the grant date |  |
Anniversary period from grant date, for grants made prior to 2019 (in years) | 3 years |  |
Performance Shares |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) | $ 0.2 | $ 3.4 | $ 2.5
Unrecognized compensation expense before income tax (in dollars) | $ 2.2 |  |
Recognition period for unrecognized compensation expense (in years) | 1 year 10 months 24 days |  |
Number of shares of other than options granted during the period (in shares) | 328,310 | 228,037 | 93,298
Performance period (in years) | 3 years |  |
Period of U.S. Treasury rates as a basis for assumed risk-free rates (in years) | 3 years |  |
2013 Omnibus Plan |  |  |
Stock-Based Compensation |  |  |
Share-based compensation, shares authorized (in shares) | 7,477,395 |  |
Performance Shares 2020 | Performance Shares |  |  |
Stock-Based Compensation |  |  |
Performance period (in years) | 3 years |  |
Percentage of shares paid based on total shareholder return relative to peer group (as a percent) | 50.00% |  |
Percentage of shares paid based on adjusted EBITDA (as a percent) | 50.00% |  |
Increase decrease in percentage of shares paid based on total shareholder return relative to defined peer group | 20.00% |  |
Percentage of shares of other than options granted during the period | 200.00% |  |
Performance Shares 2020 | Performance Shares | Minimum |  |  |
Stock-Based Compensation |  |  |
Number of shares of other than options granted during the period (in shares) | 0 |  |
Performance Shares 2019 | Performance Shares |  |  |
Stock-Based Compensation |  |  |
Performance period (in years) |  | 3 years |
Percentage of shares paid based on total shareholder return relative to peer group (as a percent) |  | 50.00% |
Percentage of shares paid based on adjusted EBITDA (as a percent) |  | 50.00% |
Performance Shares 2019 | Performance Shares | Minimum |  |  |
Stock-Based Compensation |  |  |
Number of shares of other than options granted during the period (in shares) |  | 0 |
Performance Shares 2018 | Performance Shares |  |  |
Stock-Based Compensation |  |  |
Performance period (in years) |  |  | 3 years
Percentage of shares paid based on total shareholder return relative to peer group (as a percent) |  |  | 50.00%
Percentage of shares paid based on adjusted EBITDA (as a percent) |  |  | 50.00%
Performance Shares 2018 | Performance Shares | Minimum |  |  |
Stock-Based Compensation |  |  |
Number of shares of other than options granted during the period (in shares) |  |  | 0

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