Acquisitions - Summary of Allocation of Purchase Price Between Assets Acquired and Liabilities Assumed (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Purchase price allocation:
Land	$ 141,097
Building and improvements	343,819
In-place lease intangible assets	27,965
Above-market lease intangible assets	2,976
Accounts receivable and other assets	1,338
Below-market lease intangible liabilities	(11,472)
Accounts payable and other liabilities	(6,532)
Notes and mortgages payable	(228,000)
Net assets acquired	$ 271,191