Supplemental Disclosure to Statements of Cash Flows (Tables)

3 Months Ended

Mar. 31, 2013

Supplemental Disclosure to Statements of Cash Flows [Abstract]

Supplemental Disclosure to Statements of Cash Flows

	2013		2012
Write-off of fully depreciated/amortized property and deferred costs	$	7,182	$	7,643
Write-off of depreciated/amortized property and deferred costs due to sale	$	23,906	$	3,331
Write-off of origination costs relating to preferred unit redemption	$	—	$	2,771