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Capital of the Operating Partnership (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Capital of the Operating Partnership [Line Items]        
Ownership interest (in percentage) 90.80%      
Total units outstanding ( in shares) 125,469,878      
Shares outstanding (in shares) 113,992,837 112,347,451    
Cash redemption of OP Units (in shares) 201,950      
Equity redemption of OP Units, cash (in shares) 201,950      
Equity Redemption of OP Units Cash Dollars $ 3.7      
OP Units        
Capital of the Operating Partnership [Line Items]        
Non-controlling interest redemption value $ 187.9      
Non-controlling interest redemption value (in usd per share) $ 16.37      
Common Stock        
Capital of the Operating Partnership [Line Items]        
Shares outstanding (in shares) 113,992,837 112,347,451 109,301,762 99,531,034
Limited Partner’s Capital | Retail Opportunity Investments Partnership L.P.        
Capital of the Operating Partnership [Line Items]        
Total units outstanding ( in shares) 11,477,041 11,678,991 11,668,061 [1] 12,195,603 [1]
Cash redemption of OP Units (in shares) [1] 201,950 7,064 2,206,613  
[1] Consists of limited partnership interests held by third parties.