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Share-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 16, 2018
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted in period (in shares)     48,400  
Outstanding (in shares)   1,521,628 1,521,628 1,644,212
Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-cash stock-based compensation expense   $ 300 $ 8,400  
Unrecognized compensation expense   2,200 $ 2,200  
Unrecognized compensation expense, period for recognition     2 years 6 months  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-cash stock-based compensation expense   200 $ 800  
Unrecognized compensation expense   $ 8,100 $ 8,100  
Unrecognized compensation expense, period for recognition     3 years 11 months  
Granted during period (in shares)     0  
Canceled during period (in shares)     0  
Performance Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Consecutive Trading Day Period 60 days      
Service period subsequent to IPO 181 days      
Incremental fair value from modification $ 2,900      
Long-Term Incentive Plan [Member] | Performance Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding (in shares)   668,000 668,000  
Tranche B [Member] | Long-Term Incentive Plan [Member] | Performance Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Investor IRR, equal to or in excess (as a percent) 20.00%      
Minimum cash-on-cash return on investor investments 2.5      
Share-based Compensation Arrangement by Share-based Payment Award, Threshold Share Price $ 19.11      
Tranche C [Member] | Long-Term Incentive Plan [Member] | Performance Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Investor IRR, equal to or in excess (as a percent) 25.00%      
Minimum cash-on-cash return on investor investments 3.0      
Share-based Compensation Arrangement by Share-based Payment Award, Threshold Share Price $ 22.93      
Minimum [Member] | Long-Term Incentive Plan [Member] | Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years  
Minimum [Member] | Tranche A [Member] | Long-Term Incentive Plan [Member] | Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage     20.00%  
Maximum [Member] | Long-Term Incentive Plan [Member] | Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     5 years  
Maximum [Member] | Tranche A [Member] | Long-Term Incentive Plan [Member] | Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage     25.00%