Supplemental Disclosure to Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Supplemental Cash Flow Information [Abstract]
Write-off of fully depreciated/amortized property and deferred costs	$ 12,280	$ 12,685
Write-off of depreciated/amortized property and deferred costs due to sale/demolition	2,506	32,323
Redemption of noncontrolling interests - common units	27	0
Unrealized gain (loss) on cash flow hedge	313	(1,360)
Changes in accrued development capital expenditures	7,421	394
Capitalized equity-based compensation	$ 604	$ 569