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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock-Based Compensation |  |  |
Share-based compensation, remaining shares available for issuance (in shares) | 4,992,222 |  |
Period of U.S. Treasury rates as a basis for assumed risk-free rates (in years) | 10 years |  |
Engineering Selling and Administrative Expenses |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) | $ 9.5 | $ 7.5 | $ 6.3
Restricted Stock | Other Expense |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) |  | 0.1 |
Restricted Stock | Restructuring Charges |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) |  | 0.7 | 0.6
Stock Options |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) | $ 2.7 | $ 2.4 | $ 1.9
Number of share options granted during the period (in shares) | 210,243 | 187,484 | 273,800
Weighted average grant date fair value, options (in dollars per share) | $ 8.07 | $ 15.66 | $ 12.16
Unrecognized compensation expense before income tax (in dollars) | $ 2.3 |  |
Recognition period for unrecognized compensation expense (in years) | 1 year 3 months 18 days |  |
Total intrinsic value of stock options exercised | $ 0.5 | $ 1.1 | $ 3.0
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) | $ 3.4 | $ 2.6 | $ 3.1
Unrecognized compensation expense before income tax (in dollars) | $ 3.7 |  |
Recognition period for unrecognized compensation expense (in years) | 1 year 7 months 6 days |  |
Number of shares of other than options granted during the period (in shares) | 229,044 | 111,713 | 152,855
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 |  |
Restricted Stock Units | Non-employee Directors |  |  |
Stock-Based Compensation |  |  |
Number of shares of other than options granted during the period (in shares) | 50,673 | 25,021 | 33,208
Vesting rights, annual increments beginning on the grant date | second anniversary |  |
Performance Shares |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) | $ 3.4 | $ 2.5 | $ 1.3
Period of U.S. Treasury rates as a basis for assumed risk-free rates (in years) | 3 years |  |
Unrecognized compensation expense before income tax (in dollars) | $ 4.3 |  |
Recognition period for unrecognized compensation expense (in years) | 2 years |  |
Number of shares of other than options granted during the period (in shares) | 228,037 | 93,298 | 115,047
Performance period (in years) | 3 years |  |
Common stock, shares reserved for future issuance | 87,642 |  |
2013 Omnibus Plan |  |  |
Stock-Based Compensation |  |  |
Share-based compensation, shares authorized (in shares) | 7,477,395 |  |
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 2019 | Performance Shares | Maximum |  |  |
Stock-Based Compensation |  |  |
Number of shares of other than options granted during the period (in shares) | 452,890 |  |
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 |
Performance Shares 2018 | Performance Shares | Maximum |  |  |
Stock-Based Compensation |  |  |
Number of shares of other than options granted during the period (in shares) |  | 179,770 |
Performance Shares 2017 | 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 2017 | Performance Shares | Minimum |  |  |
Stock-Based Compensation |  |  |
Number of shares of other than options granted during the period (in shares) |  |  | 87,642

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