Dispositions	3 Months Ended
Mar. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Dispositions	Dispositions: The following are recent dispositions of properties: On January 18, 2017, the Company sold Cascade Mall, a 589,000 square foot regional shopping center in Burlington, Washington; and Northgate Mall, a 750,000 square foot regional shopping center in San Rafael, California, in a combined transaction for $170,000, resulting in a gain on the sale of assets of $59,713. The proceeds were used to pay off the mortgage note payable on Northgate Mall and to repurchase shares of the Company's common stock under the 2017 Stock Buyback Program (See Note 13—Stockholders' Equity). On November 16, 2017, the Company sold 500 North Michigan Avenue, a 326,000 square foot office building in Chicago, Illinois for $86,350, resulting in a gain on sale of assets of $14,597. The Company used the proceeds from the sale to pay down its line of credit and for other general corporate purposes.

Dispositions

3 Months Ended

Mar. 31, 2018

Discontinued Operations and Disposal Groups [Abstract]

Dispositions:

The following are recent dispositions of properties:

On January 18, 2017, the Company sold Cascade Mall, a 589,000 square foot regional shopping center in Burlington, Washington; and Northgate Mall, a 750,000 square foot regional shopping center in San Rafael, California, in a combined transaction for $170,000, resulting in a gain on the sale of assets of $59,713. The proceeds were used to pay off the mortgage note payable on Northgate Mall and to repurchase shares of the Company's common stock under the 2017 Stock Buyback Program (See Note 13—Stockholders' Equity).

On November 16, 2017, the Company sold 500 North Michigan Avenue, a 326,000 square foot office building in Chicago, Illinois for $86,350, resulting in a gain on sale of assets of $14,597. The Company used the proceeds from the sale to pay down its line of credit and for other general corporate purposes.