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Lease Intangibles - Summary of the Carrying Amounts for Acquired Real Estate Leases and Assumed Real Estate Lease Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Acquired real estate leases $ 3,691 $ 77,874
Acquired real estate leases, net 275 23,847
Acquired in-place leases    
Finite-Lived Intangible Assets [Line Items]    
Acquired in-place leases 3,691 56,853
Accumulated amortization (3,416) (41,978)
Acquired above market leases    
Finite-Lived Intangible Assets [Line Items]    
Acquired above market leases 0 21,021
Accumulated amortization 0 (12,049)
Acquired below market leases    
Finite-Lived Intangible Assets [Line Items]    
Acquired below market leases 1,570 6,093
Accumulated amortization (1,453) (5,092)
Assumed real estate lease obligations, net $ 117 $ 1,001