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Intangible Assets and Liabilities - Summary of Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 25,633 $ 20,879 $ 19,325
Deferred leasing costs 1,806 1,703 1,789
Amortization of deferred leasing costs and intangible assets 27,439 22,582 21,114
Amortization of intangible liabilities 8,563 6,676 4,185
Leases, Acquired-in-Place [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets 22,580 18,298 16,546
Above Market Leases [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets 3,053 2,581 2,779
Below Market Leases Acquired [Member]      
Finite-Lived Intangible Assets [Line Items]      
Below market lease costs $ 8,563 $ 6,676 $ 4,185