Supplemental Disclosure to Statements of Cash Flows (Tables)

12 Months Ended

Dec. 31, 2012

Supplemental Disclosure to Statements of Cash Flows [Abstract]

Supplemental Disclosure to Statements of Cash Flows

	2012			2011		2010
Write-off of fully depreciated/amortized property and deferred costs	$	31,069		$	16,591	$	35,658
Write-off of depreciated property and deferred costs due to sale	106,698			110,414		12,715
Write-off of preferred units costs due to redemption	2,806			—		—
Assumption of mortgage loans in connection with the acquisition of properties	(12,537		)	—		(2,833		)
Equity contribution from consolidated joint venture partner	—			3,500		—
Issuance of preferred units	—			16,597		—