Variable Interest Entities (Narrative) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2015 joint_venture property	Dec. 31, 2014 joint_venture property
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Number of VIE real estate joint ventures	1	1
Number of neighborhood/community shopping centers	15	15
Unconsolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Number of VIE real estate joint ventures	1	1