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Share-Based Compensation - Summary (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 12, 2018
$ / shares
shares
Feb. 07, 2017
$ / shares
shares
Feb. 10, 2016
$ / shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
installment
$ / shares
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized under plan (shares)       10,400,000   10,400,000    
Share-based compensation cost capitalized as part of real estate assets | $       $ 102 $ 85 $ 224 $ 214  
Weighted-Average Grant Date Fair Value                
Unrecognized compensation cost related to nonvested stock awards | $       $ 6,311   $ 6,311    
Compensation cost to be recognized over a weighted-average period           2 years 7 months 55 days    
Number of shares authorized to be granted annually (shares)       200,000   200,000    
Chief Executive Officer                
Shares                
Granted (shares) 240,164 115,082            
Weighted-Average Grant Date Fair Value                
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares $ 3.13 $ 5.62            
Officer                
Shares                
Granted (shares) 120,064 162,294            
Weighted-Average Grant Date Fair Value                
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares $ 1.63 $ 7.74            
Vested at conclusion of performance period                
Weighted-Average Grant Date Fair Value                
Vesting rate (as a percent)           60.00%    
Remaining percentage after performance period                
Weighted-Average Grant Date Fair Value                
Vesting rate (as a percent)           40.00%    
Vested each year for the first two anniversaries after conclusion of performance period                
Weighted-Average Grant Date Fair Value                
Vesting rate (as a percent)           20.00%    
Restricted Stock Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense | $       $ 709 933 $ 2,476 2,363  
Shares                
Nonvested, beginning of period (shares)           642,359    
Granted (shares)           693,064    
Vested (shares)           (409,792)    
Forfeited (shares)           (4,750)    
Nonvested, end of period (shares)       920,881   920,881    
Weighted-Average Grant Date Fair Value                
Weighted-average grant date fair value, nonvested, beginning of period (USD per share) | $ / shares           $ 13.23    
Weighted-average grant date fair value, granted (USD per share) | $ / shares           4.55    
Weighted-average grant date fair value, vested (USD per share) | $ / shares           9.64    
Weighted-average grant date fair value, forfeited (USD per share) | $ / shares           9.21    
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares       $ 8.31   $ 8.31    
Number of annual installment for awards to vest (installment) | installment           4    
Restricted Stock Awards | Vested on date of grant                
Weighted-Average Grant Date Fair Value                
Vesting rate (as a percent)           20.00%    
Performance Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense | $       $ 533 $ 385 $ 952 $ 729  
Shares                
Nonvested, beginning of period (shares)           560,371    
Granted (shares)           741,977    
Nonvested, end of period (shares)       1,302,348   1,302,348    
Weighted-Average Grant Date Fair Value                
Weighted-average grant date fair value, nonvested, beginning of period (USD per share) | $ / shares           $ 5.91    
Weighted-average grant date fair value, granted (USD per share) | $ / shares           2.63    
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares $ 4.76 $ 6.86 $ 4.98 $ 4.04   $ 4.04    
Unrecognized compensation cost related to nonvested stock awards | $       $ 3,937   $ 3,937    
Compensation cost to be recognized over a weighted-average period           3 years 9 months 40 days    
Performance period           3 years   3 years
Total stockholder return to the national association of real estate investment trusts retail index (as a percent)           66.67%    
Absolute total stockholder return metrics (as a percent)           33.33%    
Risk-free interest rate (as a percent) 2.36% 1.53% 0.92%          
Expected share price volatility (as a percent) 42.02% 32.85% 30.95%