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Stock-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Jun. 19, 2015
USD ($)
Dec. 31, 2014
USD ($)
stock_based_compensation_plan
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock-based compensation plans | stock_based_compensation_plan         3
Compensation cost not yet recognized | $ $ 4,987        
Allocated share-based compensation expense | $ $ 5,782 $ 3,737 $ 2,515    
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average grant date fair value (in dollars per share) | $ / shares $ 3.19 $ 3.29 $ 4.00   $ 0.00
Outstanding unvested restricted stock (shares) | shares 1,535,505 1,646,523 951,555   0
2014 Retail Plan [Member] | During the year ended December 31, 2014 [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost not yet recognized | $       $ 7,845  
2014 Student Housing Plan [Member] | Plan approved during 2014 [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost not yet recognized | $   $ 313      
2014 Student Housing Plan [Member] | During the year ended December 31, 2014 [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost not yet recognized | $   $ 2,246 $ 1,796   $ 833
2015 Incentive Award Plan [Member] | 2015 Incentive Award Plan approved on June 19, 2015 [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized (shares) | shares 30,000,000        
Number of shares available for grant (shares) | shares 24,988,547        
Shares Vesting in 2017 [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding unvested restricted stock (shares) | shares 1,060,538        
Shares Vesting in 2018 [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding unvested restricted stock (shares) | shares 474,967