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Share-Based Payments (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 21, 2012
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense | $   $ 1,094 $ 552 $ 680 $ 2,466  
Unrecognized share-based compensation expense | $   $ 6,500   $ 6,500   $ 2,700
Unrecognized share-based compensation expense, remaining estimated term (years)       1 year 4 months 1 year 2 months  
Number of aggregate shares available for purchase from remaining options issued (in shares) | shares   77,942   77,942    
The 2016 Equity Incentive Plan | Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Period distribution of vested restricted stock is deferred       2 years    
Number of restricted stock units granted (in shares) | shares       35,984 23,727  
Restricted stock granted, grant date fair value (usd per share) | $ / shares       $ 10.64 $ 14.28  
Number of trading dates average price per share used for vesting requirements       20 days    
Percentage reinvested dividends to price per share, minimum       125.00%    
The 2016 Equity Incentive Plan | Restricted stock | Board of Director member            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of restricted stock units forfeited (in shares) | shares       701    
Restricted stock units vested, grant date fair value (usd per share) | $ / shares       $ 14.30    
Restricted stock units forfeited, grant date fair value (usd per share) | $ / shares       $ 14.30    
The 2016 Equity Incentive Plan | Service-based restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of restricted stock units granted (in shares) | shares       299,576 247,906  
Restricted stock granted, grant date fair value (usd per share) | $ / shares       $ 10.64 $ 14.30  
Number of restricted stock units forfeited (in shares) | shares       36,007    
Restricted stock units vested, grant date fair value (usd per share) | $ / shares       $ 12.73    
The 2016 Equity Incentive Plan | Market-based restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of restricted stock units granted (in shares) | shares       219,894    
Restricted stock granted, grant date fair value (usd per share) | $ / shares       $ 8.47    
The 2016 Equity Incentive Plan | Market-based stock option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock options granted (in shares) | shares         567,227  
Stock options granted, grant date fair value (usd per share) | $ / shares         $ 3.17  
2012 Conversion Option Plan and 2012 Special Conversion Option Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Ratio for stock options from ASPS stock to Residential stock 0.3333          
2017-2018 Service Year | The 2016 Equity Incentive Plan | Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Value of restricted stock granted to directors annually | $           $ 60
2018-2019 Service Year | The 2016 Equity Incentive Plan | Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Value of restricted stock granted to directors annually | $       $ 75