Indebtedness (Tables)

12 Months Ended

Dec. 31, 2011

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Indebtedness at December 31, 2011 and 2010 consists of the following (in thousands):

	Maturity Date	Weighted Average Interest Rate		Weighted Average Interest Rate
		2011		2010		2011		2010
Fixed rate secured debt	2012 to 2027	6.25	%	6.41	%	$	1,167,188	$	1,042,722
Variable rate secured debt	2014 to 2025	0.21	%	3.69	%	6,045		22,906
Fixed rate unsecured debt	2012 to 2028	6.56	%	6.43	%	2,616,063		2,948,405
Unsecured lines of credit	2012 to 2015	1.14	%	2.83	%	20,293		193,046
						$	3,809,589	$	4,207,079

Fair Value, Liabilities Measured on a Recurring Basis, Disclosure Only

As all of our fair value debt disclosures relied primarily on Level 3 inputs, the following table summarizes the book value and changes in the fair value of our debt for the year ended December 31, 2011 (in thousands): 

	Book Value at		Book Value at		Fair Value at				Issuances					Adjustments			Fair Value at
	December 31, 2010		December 31, 2011		December 31, 2010		Total Realized Losses/(Gains)		and Assumptions		Payoffs			to Fair Value			December 31, 2011
Fixed rate secured debt	$	1,042,722	$	1,167,188	$	1,069,562	$	—	$	178,507	$	(53,154	)	$	61,416		$	1,256,331
Variable rate secured debt	22,906		6,045		22,906		—		—		(16,861		)	—			6,045
Unsecured notes	2,948,405		2,616,063		3,164,651		—		—		(334,432		)	4,391			2,834,610
Unsecured lines of credit	193,046		20,293		193,224		—		2,248		(175,000		)	(228		)	20,244
Total	$	4,207,079	$	3,809,589	$	4,450,343	$	—	$	180,755	$	(579,447	)	$	65,579		$	4,117,230

Unsecured Lines of Credit

Our unsecured lines of credit as of December 31, 2011 are described as follows (in thousands):

				Outstanding Balance at
Description	Maximum Capacity		Maturity Date	December 31, 2011
Unsecured Line of Credit – DRLP	$	850,000	December 2015	$	—
Unsecured Line of Credit – Consolidated Subsidiary	$	30,000	July 2012	$	20,293

Schedule of Maturities of Long-term Debt

At December 31, 2011, the scheduled amortization and maturities of all indebtedness, excluding fair value and other accounting adjustments, for the next five years and thereafter were as follows (in thousands):

Year	Amount
2012	$	353,935
2013	538,374
2014	298,490
2015	372,396
2016	518,691
Thereafter	1,723,784
	$	3,805,670