Fair Value Disclosures (Assets And Liabilities Measured At Fair Value On A Non-Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Significant Unobservable Inputs (Level 3) [Member]
Rental properties, net	$ 47,100
Fair Value, Measurements, Nonrecurring [Member]
Rental properties, net	43,233
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level I) [Member]
Rental properties, net	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Rental properties, net	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Rental properties, net	$ 43,233