Fair Value Of Financial Instruments (Summary Of Fair Value Information Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest and rent receivables	$ 33,650	[1]	$ 29,862	[1]
Loans	430,207	[1]	239,839	[1]
Debt, net	(900,225)	[1]	(689,849)	[1]
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest and rent receivables	26,406	[1]	22,866	[1]
Loans	433,033	[1]	243,272	[1]
Debt, net	$ (909,159)	[1]	$ (688,032)	[1]

[1] Level II: Fair value based on quoted prices for similar or identical instruments in active or inactive markets, respectively, or calculated utilizing model-derived valuations in which significant inputs or value drivers are observable in active markets.