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Stock-Based Compensation - Narrative (Details)
1 Months Ended 12 Months Ended
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%