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Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Details) - Series I-2 - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Preferred Units [Line Items]      
AMOUNT $ 7,537    
UNITS (in shares/units) 301,483    
LIQUIDATION PREFERENCE (USD per share) $ 25    
DIVIDEND RATE 6.25%    
Preferred distributions $ 472 $ 472 $ 472