Acquired Properties - Estimated Fair Value of Retail Properties Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Business Combinations [Abstract]
Land	$ 21,629	$ 75,194
Building and other improvements	121,815	181,389
Total investment properties	143,444	256,583
Intangible assets	13,500	25,193
Intangible liabilities	(4,956)	(8,516)
Net other assets and liabilities	312	16,640
Total fair value of assets acquired and liabilities assumed	$ 152,300	$ 289,900