Indebtedness (Tables)

9 Months Ended

Sep. 30, 2014

Debt Disclosure [Abstract]

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

	Book Value at 12/31/13		Book Value at 9/30/14		Fair Value at 12/31/13		Issuances and Assumptions		Payments/Payoffs			Adjustments to Fair Value		Fair Value at 9/30/14
Fixed rate secured debt	$	1,081,035	$	1,000,451	$	1,145,717	$	—	$	(77,347	)	$	22,044	$	1,090,414
Variable rate secured debt	19,089		3,400		19,089		—		(15,689		)	—		3,400
Unsecured debt	3,066,252		3,064,696		3,250,518		—		(1,556		)	57,476		3,306,438
Unsecured line of credit	88,000		140,000		88,383		52,000		—			96		140,479
Total	$	4,254,376	$	4,208,547	$	4,503,707	$	52,000	$	(94,592	)	$	79,616	$	4,540,731

Unsecured Line of Credit

Description	Maximum Capacity		Maturity Date	Outstanding Balance at September 30, 2014
Unsecured Line of Credit - Partnership	$	850,000	December 2015	$	140,000