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Debt And Lines Of Credit , Narrative - Aspen Preferred OP Units and Series B-3 preferred OP units (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
Rate
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]              
Lines of credit       $ 183,898   $ 128,000  
Financial Instruments Subject to Mandatory Redemption, Rate Of Return   6.00%          
Financial Instruments Subject to Mandatory Redemption, Term   7 years          
Secured Debt [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount     $ 250,000 400,000 $ 265,000 21,700 $ 228,000
Preferred Equity, Mandatorily Redeemable [Member]              
Debt Instrument [Line Items]              
Financial Instruments Subject to Mandatory Redemption, Value of Shares Issued   $ 35,300          
Preferred OP units - mandatorily redeemable       35,249   35,277  
Aspen Preferred OP Units [Member]              
Debt Instrument [Line Items]              
Preferred OP units - mandatorily redeemable       $ 34,663   37,338  
Aspen Preferred OP Units [Member] | Convertible debt - Aspen Preferred OP Units January 2024 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount           $ 34,700  
Debt Instrument, Convertible, Number of Equity Instruments | shares     407,190        
Conversion Price (in dollars per share) | $ / shares       $ 68.00      
Debt Instrument, Basis Price in Stock Conversion Calculation | $ / shares       $ 27.00      
Debt Instrument, Convertible, Percent Of Amount By Which The Market Price Of Common Stock Exceeds Threshold       25.00%      
Debt Instrument, Interest Rate During Period | Rate       6.50%      
Series B-3 Preferred OP Units | Convertible debt - Aspen Preferred OP Units January 2024 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount       $ 2,700      
Common OP Units [Member] | Aspen Preferred OP Units [Member] | Convertible debt - Aspen Preferred OP Units January 2024 [Member]              
Debt Instrument [Line Items]              
Conversion Price (in dollars per share) | $ / shares       $ 0.397      
Series B-3 Preferred OP Units              
Debt Instrument [Line Items]              
Stock Redeemed or Called During Period, Shares | shares 26,750            
Temporary Equity, Redemption Price Per Share Including Accrued and Unpaid Dividends | $ / shares $ 100.153424            
Stock Redeemed or Called During Period, Value $ 2,700