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Stock-Based Compensation (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Nov. 15, 2018
shares
Feb. 02, 2018
shares
Dec. 31, 2018
USD ($)
Vesting_Installlment
$ / shares
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Vesting_Installlment
$ / shares
shares
Dec. 31, 2017
USD ($)
Nov. 21, 2006
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock based compensation reflected in additional paid in capital | $     $ 1.0 $ 0.6 $ 1.6 $ 1.0  
Increase in share-based compensation included in other accrued expenses | $     $ 0.7 $ 0.2 $ 1.4 $ 0.4  
2007 Long-Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized (in shares)             1,429,000
Right to purchase common stock, minimum price per share (USD per share) | $ / shares         $ 1.47    
Right to purchase common stock, maximum price per share (USD per share) | $ / shares         $ 10.5    
Contractual term of stock options granted         10 years    
2007 Long-Term Incentive Plan | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based payment award, vesting period         1 year    
2007 Long-Term Incentive Plan | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based payment award, vesting period         3 years    
2010 Long-Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized (in shares)   475,000 1,000,000   1,000,000    
Right to purchase common stock, minimum price per share (USD per share) | $ / shares         $ 5.60    
Right to purchase common stock, maximum price per share (USD per share) | $ / shares         $ 20.09    
Contractual term of stock options granted         10 years    
2010 Long-Term Incentive Plan | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based payment award, vesting period         1 year    
2010 Long-Term Incentive Plan | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based payment award, vesting period         4 years    
2017 Long-Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized (in shares)     2,265,000   2,265,000    
Share based payment award, vesting period         3 years    
Number of additional shares authorized (in shares) 715,000 425,000          
Right to purchase common stock, non-vested and outstanding, exercise price (USD per share) | $ / shares     $ 4.44   $ 4.44    
Options outstanding, net of awards expired (in shares)     500,000   500,000    
2017 Long-Term Incentive Plan Excluding 2010 Long-Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized (in shares)   1,790,000          
2016 Performance Incentive Plan | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based payment award, vesting period         3 years    
Shares issued         0    
Number of vesting installments | Vesting_Installlment     3   3    
Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock issued under Employee Stock Purchase Plan (in shares)     0   0