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Debt And Lines Of Credit , Narrative - Aspen Preferred OP Units and Series B-3 preferred OP units (Details) - Preferred OP units [Member] - Convertible debt - Aspen Preferred OP Units January 2024 [Member]
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
shares
Rate
Dec. 31, 2014
$ / shares
shares
Dec. 31, 2016
$ / shares
Debt Instrument [Line Items]      
Debt instrument, face amount | $ $ 34.7    
Convertible units to shares (in shares) 481,284    
Debt Instrument, Interest Rate During Period | Rate 6.50%    
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 68.00 $ 27.00
Conversion of Stock, Shares Converted   0.397