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Stock-Based Compensation - Narrative (Details)
$ in Millions
3 Months Ended
Nov. 17, 2017
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2017
USD ($)
shares
Stock-Based Compensation      
Stockholders' equity stock split, conversion ratio 0.25    
Stock-based compensation expense (in dollars) | $   $ 2.4 $ 2.2
Stock Options      
Stock-Based Compensation      
Number of share options granted during the period (in shares)   160,462 273,800
Restricted Stock Units (RSUs)      
Stock-Based Compensation      
Number of shares of other than options granted during the period (in shares)   55,146 135,353
Restricted Stock Units (RSUs) | Officers And Employees      
Stock-Based Compensation      
Expiration period of restrictions (in years)   3 years  
Restricted Stock Units (RSUs) | Director      
Stock-Based Compensation      
Expiration period of restrictions (in years)   2 years  
Performance Shares      
Stock-Based Compensation      
Number of shares of other than options granted during the period (in shares)   76,531 115,047
Options Granted in 2018 | Stock Options      
Stock-Based Compensation      
Vesting period (in years)   3 years  
Expiration period (in years)   10 years  
Options Granted in 2017 | Stock Options      
Stock-Based Compensation      
Vesting period (in years)     3 years
Expiration period (in years)     10 years
2013 Omnibus Plan      
Stock-Based Compensation      
Share-based compensation, shares authorized (in shares)   7,477,395  
Stockholders' equity stock split, conversion ratio   0.25  
Performance Shares 2018 | Performance Shares      
Stock-Based Compensation      
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 period (in years)   3 years  
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)   153,062  
Performance Shares 2017 | Performance Shares      
Stock-Based Compensation      
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 period (in years)     3 years
Performance Shares 2017 | Performance Shares | Minimum      
Stock-Based Compensation      
Number of shares of other than options granted during the period (in shares)     0
Performance Shares 2017 | Performance Shares | Maximum      
Stock-Based Compensation      
Number of shares of other than options granted during the period (in shares)     197,530