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Basis of Presentation and Summary of Significant Accounting Policies - Acquisition of Real Estate and Related Depreciation and Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate Properties [Line Items]      
Weighted average depreciable life of acquired buildings and improvements 15 years    
Below market lease, net $ 18,700 $ 9,100  
Below market lease, accumulated amortization 36,700 34,400  
Amortization of below market lease 2,300 $ 1,300 $ 1,700
Schedule of expected amortization of below market obligations related to acquired leases      
2019 1,986    
2020 1,741    
2021 1,668    
2022 1,621    
2023 $ 1,571    
Leases, Acquired-in-Place, Market Adjustment      
Real Estate Properties [Line Items]      
Weighted average amortization period of below market leases 6 years 4 months    
Weighted Average | Building and Building Improvements      
Real Estate Properties [Line Items]      
Weighted average depreciable life of acquired buildings and improvements 28 years