Notes Payable and Unsecured Credit Facilities Notes Payable and Unsecured Credit Facilities(Tables)

12 Months Ended

Dec. 31, 2011

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

The Company’s outstanding debt at December 31, 2011 and 2010 consists of the following (in thousands):

		2011	2010
Notes payable:
Fixed rate mortgage loans	$	439,880	402,151
Variable rate mortgage loans		12,665	11,189
Fixed rate unsecured loans		1,489,895	1,671,129
Total notes payable		1,942,440	2,084,469
Unsecured credit facilities		40,000	10,000
Total	$	1,982,440	2,094,469

Schedule of Maturities of Long-term Debt [Table Text Block]

As of December 31, 2011, scheduled principal payments and maturities on notes payable were as follows (in thousands):

Scheduled Principal Payments and Maturities by Year:		Scheduled Principal Payments	Mortgage Loan Maturities	Unsecured Maturities (1)		Total
2012	$	6,998	—	192,377		199,375
2013		6,996	16,330	—		23,326
2014		6,481	28,519	150,000		185,000
2015		5,169	46,313	390,000		441,482
2016		4,857	14,161	—		19,018
Beyond 5 Years		24,490	288,046	800,000		1,112,536
Unamortized debt (discounts) premiums, net		—	4,185	(2,482	)	1,703
Total	$	54,991	397,554	1,529,895		1,982,440
(1) Includes unsecured public debt and the Line. The Line is included in 2015 maturities and matures in September 2015.