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Stock-Based Compensation - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Nov. 17, 2017
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
shares
Stock-Based Compensation          
Stockholders' equity reverse stock split, conversion ratio 0.25        
Stock-based compensation expense (in dollars) | $   $ 1.9 $ 1.5 $ 6.0 $ 4.7
Stock Options          
Stock-Based Compensation          
Number of share options granted during the period (in shares)   0 0 187,484 273,800
Restricted Stock Units (RSUs)          
Stock-Based Compensation          
Number of shares of other than options granted during the period (in shares)   15,425 2,500 96,291 138,266
Performance Shares          
Stock-Based Compensation          
Number of shares of other than options granted during the period (in shares)   0 0 93,298 115,047
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
Restricted Stock Units (RSUs) 2018 | Restricted Stock Units (RSUs) | Officers And Employees          
Stock-Based Compensation          
Expiration period of restrictions (in years)       3 years  
Restricted Stock Units (RSUs) 2018 | Restricted Stock Units (RSUs) | Director          
Stock-Based Compensation          
Expiration period of restrictions (in years)       0 years  
Restricted Stock Units (RSUs) 2017 | Restricted Stock Units (RSUs) | Officers And Employees          
Stock-Based Compensation          
Expiration period of restrictions (in years)         3 years
Restricted Stock Units (RSUs) 2017 | Restricted Stock Units (RSUs) | Director          
Stock-Based Compensation          
Expiration period of restrictions (in years)         2 years
2013 Omnibus Plan          
Stock-Based Compensation          
Share-based compensation, shares authorized (in shares)   7,477,395   7,477,395  
Stockholders' equity reverse 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)       185,184  
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)         196,316