Indebtedness (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Indebtedness at December 31, 2014 and 2013 consists of the following (in thousands):

	Maturity Date	Weighted Average Interest Rate		Weighted Average Interest Rate
		2014		2013		2014		2013
Fixed rate secured debt	2015 to 2027	6.27	%	6.23	%	$	979,842	$	1,081,035
Variable rate secured debt	2025	0.13	%	2.11	%	3,400		19,089
Unsecured debt	2015 to 2028	5.22	%	5.36	%	3,364,161		3,066,252
Unsecured line of credit	2019	1.22	%	1.42	%	106,000		88,000
						$	4,453,403	$	4,254,376

Unsecured Lines of Credit

Our unsecured line of credit at December 31, 2014 is described as follows (in thousands):

				Outstanding Balance at
Description	Borrowing Capacity		Maturity Date	December 31, 2014
Unsecured Line of Credit – Partnership	$	1,200,000	January 2019	$	106,000

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, 2014 (in thousands): 

	Book Value at		Book Value at		Fair Value at		Issuances					Adjustments			Fair Value at
	December 31, 2013		December 31, 2014		December 31, 2013		and Assumptions		Payoffs			to Fair Value			December 31, 2014
Fixed rate secured debt	$	1,081,035	$	979,842	$	1,145,717	$	—	$	(97,188	)	$	16,772		$	1,065,301
Variable rate secured debt	19,089		3,400		19,089		—		(15,689		)	—			3,400
Unsecured debt	3,066,252		3,364,161		3,250,518		300,000		(2,092		)	55,049			3,603,475
Unsecured line of credit	88,000		106,000		88,383		18,000		—			(383		)	106,000
Total	$	4,254,376	$	4,453,403	$	4,503,707	$	318,000	$	(114,969	)	$	71,438		$	4,778,176

Schedule of Maturities of Long-term Debt

Scheduled Maturities and Interest Paid

At December 31, 2014, 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
2015	$	441,061
2016	529,984
2017	554,840
2018	307,855
2019	881,374
Thereafter	1,735,633
	$	4,450,747