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Acquired Assets - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Business Combinations [Abstract]    
Land $ 125,990 $ 141,215
Building and other improvements 440,204 239,149
Total investment properties 566,194 380,364
Intangible assets 69,306 37,432
Intangible liabilities (19,099) (16,477)
Net other assets and liabilities 17,024 258
Total fair value of assets acquired and liabilities assumed $ 633,425 $ 401,577