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Stock-Based and Other Long Term Incentive Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Range of payout of shares for each executive, minimum   0.00%  
Range of payout of shares for each executive, maximum   150.00%  
Time-based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation expense   $ 1.3  
Vesting period   3 years  
Performance-Based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation expense   $ 1.3  
The 2015 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,041,661   1,041,661
The 2015 Plan | Executive officer and key employees | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred compensation arrangement with individual, shares issued   917,901  
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share)   $ 10.58  
The 2015 Plan | Non-employee director | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred compensation arrangement with individual, shares issued   85,578  
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share)   $ 10.75  
Allocated share-based compensation expense $ 1.5    
The 2015 Plan | Non-employee director | Restricted Stock Units | Vesting period one      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period     90 days
The 2015 Plan | Non-employee director | Restricted Stock Units | Vesting period two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period     2 years