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Noncontrolling Interest - Operating Partnership/Limited Partners' Equity - Preferred Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Temporary Equity [Line Items]            
AMOUNT $ 5,337 $ 5,337 $ 7,537 $ 7,537 $ 7,537 $ 7,537
Preferred units redeemed (in shares) 88,000          
Preferred units redeemed, value $ 2,200          
Series I-2            
Temporary Equity [Line Items]            
UNITS 213,483   301,483      
LIQUIDATION PREFERENCE (in usd per share) $ 25          
DIVIDEND RATE 6.25%