Properties (Tables)

12 Months Ended

Dec. 31, 2011

Properties [Abstract]

Schedule of Real Estate Properties [Table Text Block]

	2011			2010
Land	$	333,375		$	271,662
Buildings, improvements, and equipment	3,625,400			3,194,309
Construction in process	15,479			15,626
Development pre-construction costs	46,700			46,700
	$	4,020,954		$	3,528,297
Accumulated depreciation and amortization	(1,271,943		)	(1,199,247		)
	$	2,749,011		$	2,329,050