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Stock-Based Compensation - Narrative (Details) | 1 Months Ended | 12 Months Ended
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Apr. 30, 2015 shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares
Stock-Based Compensation |  |  |  |
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) |  | $ 7,500,000 | $ 6,300,000 | $ 4,900,000
(Loss) Income from Discontinued Operations |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) |  | $ 0 | 0 | 300,000
Non Employee |  |  |  |
Stock-Based Compensation |  |  |  |
Options vesting percentage |  | 100.00% |  |
Stock Options |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) |  | $ 2,400,000 | $ 1,900,000 | $ 1,800,000
Number of share options granted during the period (in shares) | shares |  | 187,484 | 273,800 | 439,741
Weighted average grant date fair value, options (in dollars per share) | $ / shares |  | $ 15.66 | $ 12.16 | $ 8.20
Unrecognized compensation expense before income tax (in dollars) |  | $ 3,400,000 |  |
Recognition period for unrecognized compensation expense (in years) |  | 1 year 8 months 12 days |  |
Total intrinsic value of stock options exercised |  | $ 1,100,000 | $ 3,000,000 | $ 6,300,000
Stock Options | Officers And Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting rights, annual increments beginning on the grant date |  | 25% increments beginning on the first anniversary of the grant date |  |
Vesting period (in years) |  | 4 years |  |
Expiration period for grants made prior to 2011 (in years) |  | ten years |  |
Anniversary period from grant date, for grants made prior to 2011 (in years) |  | 2 years |  |
Vesting rights percentage for grants made prior to 2011 (as a percent) |  | 25.00% |  |
Stock Options | Directors |  |  |  |
Stock-Based Compensation |  |  |  |
Expiration period (in years) |  | 10 years |  |
Vesting period (in years) |  | 3 years | 4 years |
Anniversary period from grant date, for grants made prior to 2011 (in years) |  | 1 year |  |
Vesting rights percentage for grants made prior to 2011 (as a percent) |  | 25.00% |  |
Restricted Stock |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) |  |  |  | 1,800,000
Unrecognized compensation expense before income tax (in dollars) |  | $ 0 |  |
Number of shares of other than options granted during the period (in shares) | shares |  |  | 0 |
Restricted Stock | Other Expense |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) |  |  | $ 100,000 | 2,800,000
Restricted Stock | Restructuring Charges |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) |  | 700,000 | 600,000 | 1,300,000
Restricted Stock | Certain Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of other than options granted during the period (in shares) | shares | 80,548 |  |  |
Restricted Stock Units |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) |  | 2,600,000 | $ 3,100,000 | $ 400,000
Unrecognized compensation expense before income tax (in dollars) |  | $ 3,000,000 |  |
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) | shares |  | 111,713 | 152,855 | 157,402
Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) |  | $ 2,500,000 | $ 1,300,000 | $ 1,800,000
Unrecognized compensation expense before income tax (in dollars) |  | $ 3,100,000 |  |
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) | shares |  | 93,298 | 115,047 | 204,891
Performance period (in years) |  | 3 years |  |
Options Granted in 2017 | Stock Options | Officers And Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Expiration period (in years) |  | 10 years |  |
Vesting period (in years) |  | 3 years |  |
Tranche Three | Officers And Employees |  |  |  |
Stock-Based Compensation |  |  |  |
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 2011 (in years) |  | 3 years |  |
Tranche Three | Restricted Stock Units | Officers And Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Options vesting percentage |  | 100.00% |  |
2013 Omnibus Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Share-based compensation, shares authorized (in shares) | shares |  | 7,477,395 |  |
Stockholders' equity reverse stock split, conversion ratio |  | 0.25 |  |
Stock Plan 2003 | Stock Options | Officers And Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Expiration period (in years) |  | 10 years |  |
Stock Plan 2003 | Tranche Two | Restricted Stock | Officers And Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Options vesting percentage |  | 100.00% |  |
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) | shares |  | 0 |  |
Performance Shares 2018 | Performance Shares | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of other than options granted during the period (in shares) | shares |  | 185,184 |  |
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) | shares |  |  | 0 |
Performance Shares 2017 | Performance Shares | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of other than options granted during the period (in shares) | shares |  |  | 196,316 |
Performance Shares 2016 | Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of other than options granted during the period (in shares) | shares |  |  |  | 75,000
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%

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