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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 3 Months Ended
Jan. 31, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
shares
$ / shares
Rate
Dec. 31, 2018
USD ($)
Dec. 31, 2014
$ / shares
Debt Instrument [Line Items]          
Financial Instruments Subject to Mandatory Redemption, Rate Of Return   6.00%      
Financial Instruments Subject to Mandatory Redemption, Term   7 years      
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  
Preferred OP units [Member]          
Debt Instrument [Line Items]          
Preferred OP units - mandatorily redeemable     34,663 37,338  
Preferred OP units [Member] | Convertible debt - Aspen Preferred OP Units January 2024 [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount     $ 34,700 34,700  
Convertible units to shares (in shares) | shares     430,260    
Debt Instrument, Interest Rate During Period | Rate     6.50%    
Debt Instrument, Convertible, Conversion Price | $ / shares     $ 27.00   $ 68.00
Debt Instrument, Convertible, Percent Of Amount By Which The Market Price Of Common Stock Exceeds Threshold     25.00%    
Conversion of Stock, Shares Converted | shares     0.397    
Series B-3 Preferred OP Units [Member] | Convertible debt - Aspen Preferred OP Units January 2024 [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount       $ 2,700  
Series B-3 Preferred OP Units [Member]          
Debt Instrument [Line Items]          
Stock Redeemed or Called During Period, Shares | shares 26,750        
Redemption price including accrued and unpaid dividends (in dollars per share) | $ / shares $ 100.153424        
Stock Redeemed or Called During Period, Value $ 2,700