Real Property Acquisitions and Development (Details 1) (USD $)	Jun. 30, 2011
Silverado Partnership [Member]
Estimated Fair Value of Allocated Purchase Price of Asset and Liabilities
Land and land improvements	$ 11,170,000
Buildings and improvements	173,841,000
Acquired lease intangibles	19,305,000
Investment in unconsolidated subsidiary	14,960,000
Cash and cash equivalents	4,084,000
Total assets acquired	223,360,000
Secured debt	60,667,000
Total liabilities assumed	60,667,000
Capital in excess of par	6,017,000
Noncontrolling interests	7,836,000
Net assets acquired	148,840,000
Benchmark partnership [Member]
Estimated Fair Value of Allocated Purchase Price of Asset and Liabilities
Land and land improvements	60,440,000
Buildings and improvements	792,394,000
Acquired lease intangibles	68,980,000
Cash and cash equivalents	28,258,000
Restricted cash	5,451,000
Total assets acquired	955,523,000
Secured debt	524,989,000
Accrued expenses and other liabilities	17,412,000
Entrance fee liability	13,269,000
Total liabilities assumed	555,670,000
Noncontrolling interests	19,575,000
Net assets acquired	$ 380,278,000