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Organization and Summary of Significant Accounting Policies (Schedule of the amortization of acquired lease intangibles) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Net Increase to Rental Income  
Acquired Finite-Lived Intangible Assets [Line Items]  
2018 $ 1,412
2019 684
2020 609
2021 489
2022 363
Thereafter $ 7,572
Weighted average amortization period (years) 17 years 10 months 24 days
Increase To Amortization Expense  
Acquired Finite-Lived Intangible Assets [Line Items]  
2018 $ 8,249
2019 5,976
2020 5,220
2021 4,494
2022 4,024
Thereafter $ 15,625
Weighted average amortization period (years) 9 years 7 months 7 days