Investments In Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) (USD $)	3 Months Ended				6 Months Ended	9 Months Ended				12 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended		3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Jun. 30, 2013	Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012		May 31, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]	Sep. 30, 2012 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]	Sep. 30, 2013 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]	Sep. 30, 2012 Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]	Sep. 30, 2012 Sale of 7 operating properties within two unconsolidated joint ventures in 2012 [Member]	Dec. 31, 2012 Sale of 7 operating properties within two unconsolidated joint ventures in 2012 [Member]	Sep. 30, 2012 Sale of 7 operating properties within two unconsolidated joint ventures in 2012 [Member]
Investments In Joint Ventures [Abstract]
Total assets	$ 826,600,000	[1]				$ 826,600,000	[1]			$ 917,800,000	[1]
Total third-party debt	563,200,000					563,200,000				712,700,000
Total equity	234,900,000					234,900,000				165,200,000
Total revenues	27,700,000	[1]	26,600,000	[1],[2]		80,500,000	[1],[2]	79,200,000	[1],[2]
Net income	2,200,000		15,300,000			102,200,000		13,500,000
Equity in income	1,926,000	[3]	3,688,000	[3]		20,658,000	[3]	4,686,000	[3]
Schedule of Equity Method Investments [Line Items]
Revenues from discontinued operations attributable to unconsolidated joint venture													6,500,000	10,300,000	19,500,000	6,600,000		20,400,000
Number of operating properties sold	2				2					11		14					7
Revenues prior to sale of operating properties in unconsolidated joint venture			$ 1,300,000					$ 6,600,000

[1] Excludes approximately $10.3 million for the nine months ended September 30, 2013, and approximately $6.5 million and $19.5 million for the three and nine months ended September 30, 2012, respectively, relating to the discontinued operations from the sale of 14 operating properties within one of our unconsolidated joint ventures during the second quarter of 2013. Additionally, excludes approximately $6.6 million and $20.4 million for the three and nine months ended September 30, 2012, respectively, related to the discontinued operations from the sale of seven operating properties within two of our unconsolidated joint ventures during the third and fourth quarters of 2012.

[2] Includes approximately $1.3 million of revenues for the three months ended September 30, 2012 related to one previously unconsolidated joint venture acquired by us in December 2012 and approximately $6.6 million of revenues for the nine months ended September 30, 2012 related to this joint venture and 12 previously unconsolidated joint ventures acquired by us in January 2012.

[3] Equity in income excludes our ownership interest of fee income from various property and asset management services provided by us to our joint ventures.