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Intangible Assets and Liabilities - Summary of Intangible Assets and Intangible Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Acquired in-place leases $ 226,515 $ 181,145
Acquired above market leases 29,670 27,072
Intangible assets 256,185 208,217
Accumulated amortization (140,774) (135,959)
Intangible assets, net 115,411 72,258
Leasing costs 17,355 16,325
Accumulated amortization, leasing costs (8,642) (8,120)
Deferred leasing costs, net 8,713 8,205
Deferred leasing costs and other related intangibles, net 124,124 80,463
Acquired below market leases 80,862 65,740
Accumulated amortization, acquired below market leases (27,330) (21,801)
Intangible liabilities, net 53,532 43,939
Leases, Acquired-in-Place [Member]    
Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization (123,043) (118,526)
Above Market Leases [Member]    
Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization $ (17,731) $ (17,433)