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Share-Based Compensation - Summary (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 11, 2019
$ / shares
shares
Feb. 12, 2018
$ / shares
shares
Feb. 07, 2017
$ / shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
installment
$ / shares
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2015
Sep. 30, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized under plan (shares) | shares                 10,400,000
Share-based compensation cost capitalized as part of real estate assets | $       $ 13 $ 36 $ 54 $ 260    
Weighted-Average Grant Date Fair Value                  
Unrecognized compensation cost related to nonvested stock awards | $                 $ 3,534
Compensation cost to be recognized over a weighted-average period           2 years 6 months      
Number of shares authorized to be granted annually (shares) | shares                 200,000
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 | $       $ 571 787 $ 2,830 3,263    
Shares                  
Nonvested, beginning of period (shares) | shares           875,497      
Granted (shares) | shares           855,681      
Vested (shares) | shares           (746,134)      
Forfeited (shares) | shares           (12,024)      
Nonvested, end of period (shares) | shares       973,020   973,020      
Weighted-Average Grant Date Fair Value                  
Weighted-average grant date fair value, nonvested, beginning of period (USD per share) | $ / shares           $ 7.99      
Weighted-average grant date fair value, granted (USD per share) | $ / shares           2.23      
Weighted-average grant date fair value, vested (USD per share) | $ / shares           5.11      
Weighted-average grant date fair value, forfeited (USD per share) | $ / shares           5.98      
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares       $ 5.16   $ 5.16      
Number of annual installment for awards to vest (installment) | installment           4      
Fair value per share on valuation date (USD per share) | $ / shares       $ 5.16   $ 7.99     $ 5.16
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 | $       $ 409 $ 178 $ 1,278 $ 1,130    
Shares                  
Nonvested, beginning of period (shares) | shares           910,911      
Granted (shares) | shares           1,103,537      
Vested (shares) | shares           0      
Nonvested, end of period (shares) | shares       2,014,448   2,014,448      
Weighted-Average Grant Date Fair Value                  
Weighted-average grant date fair value, nonvested, beginning of period (USD per share) | $ / shares           $ 4.67      
Weighted-average grant date fair value, granted (USD per share) | $ / shares           2.40      
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares $ 4.74 $ 4.76 $ 6.86 $ 3.42   $ 3.42      
Unrecognized compensation cost related to nonvested stock awards | $                 $ 2,930
Compensation cost to be recognized over a weighted-average period           4 years      
Performance period           3 years   3 years  
Vesting rate based on achievement of TSR relative to the NAREIT retail index (as a percent)           66.67%      
Vesting rate based on the achievement of absolute TSR metrics (as a percent)           33.33%      
Stock classified as a liability due to the potential cash component (shares) | shares           566,862      
Fair value per share on valuation date (USD per share) | $ / shares $ 4.74 $ 4.76 $ 6.86 $ 3.42   $ 4.67     $ 3.42
Risk-free interest rate (as a percent) 2.54% 2.36% 1.53%            
Expected share price volatility (as a percent) 60.99% 42.02% 32.85%            
Performance Stock Units | Chief Executive Officer                  
Shares                  
Granted (shares) | shares 357,800 240,164,000              
Weighted-Average Grant Date Fair Value                  
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares $ 2.45 $ 3.13              
Fair value per share on valuation date (USD per share) | $ / shares $ 2.45 $ 3.13              
Performance Stock Units | Officer                  
Shares                  
Granted (shares) | shares 178,875 120,064,000              
Weighted-Average Grant Date Fair Value                  
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares $ 2.29 $ 1.63              
Fair value per share on valuation date (USD per share) | $ / shares $ 2.29 $ 1.63