Dispositions (Tables)

12 Months Ended

Dec. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]

The following table provides a summary of consolidated shopping centers and land parcels disposed of:

	Year ended December 31,
(in thousands)	2017		2016		2015
Net proceeds from sale of real estate investments	$	112,161	137,479	(1)	108,822
Gain on sale of real estate, net of tax	$	27,432	47,321		35,606
Provision for impairment of real estate sold	$	—	1,700		—
Number of operating properties sold	6		11		5
Number of land out-parcels sold	9		16		2
(1) Includes cash deposits received in the previous year.