Noncontrolling Interests (Redeemable And Permanent Noncontrolling Interests Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2011
Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests in Subsidiaries		$ 236,000	$ 938,000
Noncontrolling Interests [Member]
Noncontrolling Interest [Line Items]
Permanent Noncontrolling Interests in Subsidiaries, number of self-storage facilities	14
Convertible partnership units	231,978
Decrease in noncontrolling interest		100,000	26,200,000
Reduction to paid-in capital			149,300,000
Distributions paid		5,300,000	12,800,000
Income allocated to other Permanent Noncontrolling Interest in Subsidiaries		3,500,000	11,700,000
Acquisition cost		1,400,000	175,500,000
Equity Of Redeemable Noncontrolling Interest In Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Number of self-storage facilities with noncontrolling interests in Subsidiaries representing equity interests			14
Outstanding Redeemable Noncontrolling Interests, in cash		19,900,000
Decrease in noncontrolling interest		11,900,000
Reduction to paid-in capital		8,000,000
Redeemable noncontrolling interests in Subsidiaries		200,000	900,000
Distributions paid		600,000	1,600,000
Consolidated Limited Partnership [Member]
Noncontrolling Interest [Line Items]
Permanent noncontrolling interests		$ 8,200,000	$ 17,700,000