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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