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Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In preparing its consolidated financial statements, the Company evaluated events and transactions occurring after December 31, 2017 through the date the financial statements were issued for recognition and disclosure purposes. Subsequent to December 31, 2017, the Company disposed of two retail properties representing 725,000 square feet, for an aggregate gross disposition price of $96,500, and recognized an aggregate gain on sale of $18,945. In addition, IAGM disposed of one retail property representing 265,000 square feet, for an aggregate gross disposition price of $38,000.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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